Wild yam (Dioscorea villosa) and Mexican yam have been marketed as alternatives to synthetic progesterone (not estrogen), which is a hormone taken by some women during menopause. These yams contain diosgenin, a plant substance that has a chemical structure similar to progesterone. In the laboratory, diosgenin can be converted to progesterone by using specific reagents and enzymes to carry out a series of chemical reactions. This transformation can only be performed in a lab — the same process does not occur in the human body. As a result, it's actually misleading for a manufacturer to term a wild yam supplement as "natural progesterone" because it is not progesterone, nor does it have any impact on a woman's hormone levels. Since diosgenin doesn't have hormonal activity itself, creams containing this substance are not effective.
In the United States, what is commonly referred to as a "yam" is actually a variety of sweet potato (ipomoea batatas). Yams are similar in shape to sweet potatoes, but are drier and starchier in taste, and are rougher and scalier in texture. Sweet potatoes are a good source of beta-carotene, vitamin C, folic acid, and some B vitamins. Predominantly grown in the Caribbean and Africa, yams are a good source of potassium, but contain no beta-carotene, and have lower levels of B vitamins, vitamin C, and folic acid than sweet potatoes. Eating sweet potatoes or yams will provide nutrients, but, as they contain neither progesterone nor estrogen, they won't affect a woman's hormonal balance.
As they say, everything in moderation — including fiber! Eating enough fiber can have many health benefits, while too much may have consequences. By learning how much fiber you need, how much is in your food, and adjusting your diet accordingly, you’ll be able to strike a balance that’s ideal for your body (and your bowels).
Fiber is basically composed of plant-based food matter (fruits, veggies, whole grains, and legumes) that can’t be broken down by your digestive system. Whole foods contain both soluble (dissolves in water) and insoluble (does not dissolve in water) fiber. Although the recommendations below don’t distinguish between these two types of fiber, they are different and have distinct functions — soluble fiber helps to reduce cholesterol and glucose levels, and insoluble fiber helps with constipation by increasing fecal bulk.
Overall, fiber may lead to many health benefits, such as:
- Keeping you regular. Fiber decreases the risk of constipation by bulking up and softening your stool.
- Maintaining your bowel health. Fiber may prevent the development of diverticulitis and hemorrhoids. It has also been shown to reduce the symptoms of irritable bowel syndrome (IBS) in some cases.
- Lowering cholesterol and blood glucose levels. By reducing bad (LDL) cholesterol and blood glucose levels, soluble fiber also leads to a decreased risk for cardiovascular disease, coronary heart disease, and type II diabetes.
- Controlling your appetite/weight. Foods that contain fiber are typically low in fat, energy-dense, take more time to chew, keep you full for longer, and block some of the digestion of fats and proteins.
- Preventing cancer. Fiber consumption may lower the risk for colorectal cancer, but the evidence is not yet conclusive.
Curious if you are getting enough fiber in your diet? You can use either the USDA Food List or WebMD’s Fiber-o-Meter to figure out the fiber content of the foods you eat and get suggestions for high-fiber foods. Making a habit out of reading the nutrition facts on food labels will also help. Generally, women need less fiber than men, and those aged 51 years or older need less than younger individuals. The following table can give you an idea of how much fiber you need on a daily basis:
Age 50 or younger
Age 51 or older
Source: Institute of Medicine
However, having too much fiber in one's diet can cause problems. When the intake of fiber is too high, it can replace other energy and nutrients that you need in your diet. Some insoluble fibers bind certain minerals, including calcium, magnesium, phosphorous, and iron. Too much fiber can also cause abdominal discomfort, gas, and diarrhea, and block the gastrointestinal (GI) tract if you add too much fiber too fast. For some, fiber supplements may potentially cause additional, more severe side effects such as allergic reactions and asthma, gastrointestinal distress, and drug and nutrient interactions. If you feel that you might benefit from taking fiber supplements, it's best to speak with a health care provider first to make sure it’s right for you.
So, before you load up on fiber, try adding it to your diet gradually, so that your GI tract has time to adapt. You'll also want to drink lots of fluids to keep the fiber soft. Choosing a variety of soluble and insoluble fiber-rich food sources, such as fruits, vegetables, whole grain breads and cereals, and legumes (beans and peas) will ensure that not only will you get a good mix of fiber, but beneficial nutrients, too. Remember that brown rice and 100 percent whole wheat bread have more fiber than white rice or white bread. Also, eating the skins of your fruits and vegetables whenever possible can also help increase fiber intake. If you need advice or more information about incorporating fiber-rich foods into a balanced diet, consider making an appointment with a health care provider or registered dietitian.
Hope this was helpful!
It's a great idea to plan consciously when switching over to a vegetarian diet. Not eating meat can offer many health benefits, as well as addressing environmental and ethical concerns you may have regarding eating animals. However, before making the switch to a meat-free lifestyle, it is important to get a sense of the pros and cons.
Here’s the best news of all: with a well-planned diet, vegetarians can live a totally healthy lifestyle and help contribute to a better planet. The following list describes various benefits of vegetarianism:
- Plant foods are abundant in nutrients, including vitamins, minerals, and protein. They also contain phytochemicals — plant chemicals that are not essential to life, but may help protect against disease — such as beta-carotene. Eating a variety of colors of fruits and vegetables can help ensure that the benefits nature provides are reaped.
- Reduce your risk of type 2 diabetes. Vegetarians benefit from eating less saturated fat and cholesterol, and higher amounts of complex carbohydrates, dietary fiber, certain minerals, and phytochemicals. Cholesterol is only found in animal foods, so vegan diets are completely cholesterol-free.
- Contribute to the vegetarian cause! Whether you have aim to respect animals, lessen your carbon footprint on the environment, or just want to make a lifestyle change, as a vegetarian you are making your own positive impact on the world. You can be proud that you are living according to the beliefs that you stand for.
Whenever you cut a food group out of your diet, it is important to understand how to replace the vital nutrients that go along with it. While the positives are all fine and dandy, it is important to be aware of the challenges of being a vegetarian:
- It can be harder to get the protein you need. Protein is important formaintaining and repairing muscle tissue, and manufacturing blood cells, antibodies, hormones, and enzymes. Fortunately, there are plenty of non-meat proteins to supplement your diet.
- Possible vitamin and mineral deficiencies can develop without a balanced eating plan. Cutting out dairy, meat, fish, and poultry reduces your intake of vitamin B12 (important for nerve transmission and necessary for life), calcium (for strong bones, among other functions), iron (for blood), and zinc (for immunity and healing), just to name a few.
- Depending on where you live, it may be challenging to adhere to a meat-free lifestyle. For example, living in a big city may provide you with endless veggie options, while a small-town lifestyle may make it more difficult to find healthy substitutions for meat.
- You may have difficulty explaining your eating habits to family and friends.While it may seem that being a vegetarian is relatively mainstream, certain cultures leave little room for herbivores. You may encounter some sticky situations where people have prepared for you a meaty meal, or perhaps, your friends and family may challenge your decision to remain meat-free.
Remember, what is included in your diet (rather than what is excluded) is what counts. It is extremely important to incorporate a balanced eating plan full of nutrient-rich foods. For help in selecting a healthy eating plan appropriate for your state of health, age, size, activity level, preferences, and moral and ethical values, consult with a registered dietitian. Columbia students can make an appointment with a registered dietician at Medical Services through Open Communicator or by calling (212) 854-7426. Informed choices are the best choices!
February 23, 2012507783
Dear Supplementally Confused,
It may depend on the type of dietary supplement. Supplements range from daily multi-vitamins and minerals to anabolic steroids. Certain supplements are recommended for various conditions. For example, calcium supplements are often encouraged to help prevent osteoporosis, and iron is recommended for those who are anemic. Pregnant women's increased nutritional needs may require that they supplement with vitamins and minerals. The performance enhancing supplements that are so widely advertised today (i.e., creatine, chromium picolinate, protein shakes, amino acids) are not needed by the average person.
The best way to get all of the nutrients your body needs is to eat a healthy diet. To do this, you should eat a variety of foods, have a good balance within the food groups (read Food Guidelines — How much is a serving? for details), eat enough calories (at least 1200), and make nutrient-dense choices, such as whole wheat bread and skim milk as opposed to white bread and whole milk.
Although vitamin and mineral supplements serve an important purpose for some people, you cannot depend on pills alone to provide your body with the nutrients it needs. Pills do not have phytochemicals, the non-nutrient compounds found in plant-derived foods that have biological activity in the body. Approximately 150 phytochemicals are found in foods along with the vitamins and minerals the body needs. Phytochemicals play a very important role in helping the body defend itself against cancer and cancer-causing agents, and probably many other things as well. An example of a known phytochemical is beta-carotene, a carotenoid. It is found in deeply pigmented fruits and vegetables, such as carrots, sweet potatoes, tomatoes, spinach, broccoli, cantaloupe, pumpkin, and apricots. Carotenoids act as antioxidants, reducing the risk of cancer. Read Antioxidants for more info.
So the best bet is to do what you were told as a child and, "eat your fruits and veggies!" Five servings a day is a great start. If you do supplement, be careful not to overdose. More of a "good" thing is not necessarily good for you. Besides being expensive, over-supplementing can be harmful to you. For more information, read What's the difference between vitamins and minerals? from the Go Ask Alice! Nutrition & Physical Activity archives.
RDAs (Recommended Dietary Allowances), prepared by the Food and Nutrition Board of the National Academy of Sciences, have been around for over 50 years, with periodic updates. The RDA is the average daily dietary intake level that would adequately meet the nutritional needs of nearly all (98 percent) healthy persons. RDAs include nutrients for which there is sufficient scientific evidence that they are required for good health. Their intention has always been to establish "standards to serve as a goal for good nutrition." RDAs provide the basis for evaluating the adequacy of diets of population groups. They are set at a level that includes a safety factor appropriate to each nutrient; so, this level actually exceeds the requirement for most individuals.
The Food and Nutrition Board has established Dietary Reference Intakes (DRIs). In addition to RDAs, DRIs include recommendations for food components for which RDAs cannot be established. Some of these include fat, carbohydrate, fiber, and plant estrogens, among others. DRIs also include maximum intake levels. Three dietary intake reference values for DRIs are:
- Adequate Intake — the dietary intake level that would adequately sustain health when an RDA cannot be determined because of insufficient scientific evidence.
- Estimated Average Requirement — the estimated dietary intake level that would maintain the health of half of a specified age and sex group.
- Tolerable Upper Intake Level — the maximum level of daily nutrient intake that's apparently safe and unlikely to cause negative health effects in most healthy individuals.
DRIs and RDAs are not developed for specific individuals, but are for the making of policies for feeding programs, food labeling, and food fortification. The numbers signify levels of each compound that are appropriate for most healthy people in each category. To access information on RDAs and DRIs, check out the United States Department of Agriculture's (USDA) Food and Nutrition Information Center website.
Vitamin supplements may contain an amount equivalent to the RDA for DRI, but you'll probably not find a supplement with every imaginable nutrient, vitamin, and mineral. There are innumerable substances that keep us healthy, many of which cannot be packaged in a pill. In addition, many nutrients are difficult for the body to absorb when they come in pill form. Obtaining nutrients directly from a balanced diet of fruits, vegetables, whole grains, and lean proteins is still the recommended manner of giving your body all it needs to be healthy.
To assess whether your current diet is filled with nutrients, check out ChooseMyPlate.gov. You can also speak with your health care provider about whether you need a multivitamin or if the food you eat is sufficient. Students at Columbia can also make an appointment to speak with a registered dietician or a health care provider either through Medical Services (Morningside) or the Student Health Service (CUMC). Take care,
How much did you bet? It's time for your co-worker to pay up!
The human body can survive a surprisingly long time on water alone, but it is nowhere near six months. When the body is deprived of new fuel (i.e., food), it breaks into its energy reserves to keep going. The body stores energy in the form of carbohydrates, fats, and proteins.
After one day without food, the body will have used up its carbohydrates, which are stored as glycogen in liver and muscle cells. After that, it's on to the fat reserves. Your average Joe/Jane, weight-wise, has enough fat reserves to live for four to six weeks without food. After that, the body begins to use its protein reserves (basically, the body itself). Body proteins are used up at a much faster rate than fat, and you could really only get another two to three weeks out of protein. At that point, however, you can't really call it living since so much irreparable damage has been done to the body, including the brain.
Bottom line: an average person could live for about eight weeks on water alone, give or take about a week for an over- or underweight person, respectively.
What’s the word on St. John’s wort? Also known by its botanical name, Hypericum perforatum, this supplement is derived from a yellow flowering plant. It has been used — with mixed results — as an herbal remedy for a wide range of ailments, including mild to moderate depression, menopausal symptoms, somatization disorder (when mental experiences are converted into physical symptoms in the body), and wound healing. Research suggests that St. John's wort raises levels of serotonin, norepinephrine, and dopamine (different neurotransmitters that help boost morale and mood), but the active ingredient that produces this effect is still unknown. More research is needed to better understand how St. John’s wort works and what beneficial effects it may have on health. You also asked about the recommended dosage for this supplement. How much of the supplement to take and the number of times you'll need to take it daily will vary depending upon the condition you wish to treat.
Although the evidence is mixed, there are a number of studies that suggest St. John’s wort can be effective in treating depression without the side effects common to traditional anti-depressant medications (It’s good to note that it’s not recommended for the treatment of severe depression). Unlike prescription anti-depressants, which can cause side effects such as lowered sex drive and delayed ejaculation and/or orgasm, the same sexual side effects have not been associated with the use of St. John's wort. However, this does not mean that the supplement is free from potential adverse side effects, some of which include:
- Dry mouth
- Vivid dreams
- Skin rash
- Gastrointestinal discomfort, such as diarrhea
- Allergic reactions
- Increased sensitivity to sunlight
Due to the lack of scientific evidence, it’s hard to know how taking St. John’s wort may affect different individuals. You may want to be especially wary of taking this supplement if you’re:
- Taking prescription medications. Anti-depressant medications, monoamine oxidase inhibitors (MAOIs), and HIV/AIDS medications combined with St. John’s wort can lead to possibly dangerous interactions. Additionally, St. John’s wort can affect how the body metabolizes medicine, which may make certain medications less effective. If you’re using any other medications, prescription or otherwise, it’s best to let your health care provider know before taking this herbal supplement.
- Pregnant or breastfeeding. Limited research has been done on women who are pregnant or breastfeeding. Until more is known, women who are pregnant or breastfeeding are advised not to take St. John's wort.
- Have certain health conditions. Components of St. John's wort may raise blood pressure, possibly resulting in a stroke. Those who are already at risk of high blood pressure should be especially cautious.
As a rule, it’s helpful to remember that "natural" does not necessarily mean safe. Since St. John's wort is an herbal supplement and not regulated by the U.S. Food and Drug Administration (FDA), the quality of the supplement may vary. For more even more detailed information, check out the National Center for Complementary and Alternative Medicine website. Before trying St. John's wort, or any other natural supplement, it’s recommended that you talk with your health care provider. Doing so may help you gather all of the necessary information to decide wort the best course of action is for you.
Eating fruits and vegetables is an essential part of maintaining good health. In 2011, the USDA launched its most recent food guide called Choose My Plate. Most health professionals and health promotion organizations, including the USDA, recommend eating at least five servings of fruits and vegetables daily. Or, in the case of the Choose My Plate campaign, make half of your plate fruits and vegetables.
Since eating vegetables is not very appealing to you, let's start by discussing ways to incorporate some essential vitamins and minerals into your diet via fruit. Look to a wide variety of fruits to take in more vitamins, minerals, and phytochemicals, which are plant substances that may ward off heart disease and certain forms of cancer. For example, a fruit salad composed of oranges, assorted berries, grapes, kiwi, bananas, apples, and peaches with fresh lime juice squeezed over it can be enjoyed as a delicious part of any meal or on its own as a snack. A piece of fruit, such as an apple or a pear, is also an excellent dessert and can be paired with protein, such as nut butter or cheese, to make a well balanced snack.
Now let's move to the incorporation of vegetables in a positive way. Vegetables can taste bitter, particularly when eaten raw. A good place to begin may be experimenting with roasting a few different vegetables to see what you may like. Roasting vegetables brings out their sweetness via a process called caramelization, which reveals the sugars in vegetables, causing them to taste sweeter. This works particularly well with root vegetables, such as onions, potatoes, sweet potatoes, turnips, and carrots. To roast vegetables, simply cut them into one-inch squares, toss with olive oil, salt, and pepper, place on a baking sheet, and put in an oven at 450 degrees for 30 to 40 minutes, tossing and turning throughout cooking. You will know they are done when they are golden brown, slightly crispy on the outside, and soft on the inside. Broccoli and cauliflower are also delicious when roasted. Feel free to experiment by adding grated parmesan or other cheeses, herbs, and spices to the vegetables after roasting. You can also look to "sweeter" vegetables, such as corn, peas, tomatoes, and carrots and incorporate them into pasta or rice dishes or put them together to make a salad. The get balanced! nutrition initiative offers some recipes to get you started, such as the Cilantro Corn Tomato Salad.
It is also possible to disguise vegetables in your food, similar to the way some parents do when their children don't eat their veggies. This is typically done using vegetable purees, which can be made at home simply by microwaving a vegetable and then pureeing it, or can be found in the freezer section (most often found are pureed sweet potatoes or squash) or as jars of baby food in the children's section of your grocery store. Purees can be added to stew, soup, pasta sauce, baked goods, etc.; the options are endless. There are several good cookbooks available that offer recipes that incorporate vegetable purees. You can also sneak in an extra veggie by making fruit smoothies with spinach added in — all you'll taste is the fruit!
In addition to purees, you can also incorporate vegetables into other foods. Examples include:
- Make omelets with tomatoes, peppers, and/or mushrooms — be sure to sauté the vegetables first before adding the eggs.
- Add broccoli and/or olives to your pizza.
- Add chopped spinach and/or grated carrots and onions to turkey burgers or meatloaf.
- Mix chopped carrot and celery into tuna or chicken salad.
- Choose soups rich in vegetables, such as Minestrone or Gumbo.
- Add peas, carrots, and/or zucchini to rice pilaf.
It's difficult to "force" yourself into liking a specific food, especially if you are turned off by the taste. Luckily, you can choose from a variety of vegetable options and cooking methods. Keep an open mind (and mouth), and perhaps you will come to enjoy some of these foods!
If you are what you eat, being healthy and time efficient sound like great qualities to have! Whether your motivations include saving time or money, improving your nutrition, maintaining or losing weight, or fostering your culinary skills, preparing your own lunch is a grand idea! Doing so can be a way to cater to your individual needs, nutritionally and conveniently, and to energize you through your busy days at school and beyond. With everything else that’s on your plate, preparing nutritious foods may seem like a challenge. However, with a few easy and balanced tips, you’ll be savoring a tasty lunch in no time.
First, a little review of the food groups may serve up some hot and cool lunch options. Main food groups include:
- Fruits, naturally sweet and juicy, are great as salad ingredients, sides, or snacks. Grab a fruit that comes with its own wrapper (e.g. apples, oranges, bananas) or a small container of grapes or cut melon. Dried and canned fruits may also make for portable options.
- Grains come as whole and refined grains. Whole grains use the entire kernel of the grain (e.g., whole wheat flour items, brown rice, oatmeal, popcorn). Refined grains have been milled to remove their bran and germ (e.g., white flour, white rice, white bread, pasta, noodles). They're great for sandwiches, wraps, noodle or rice dishes, and snacks.
- Vegetables (raw, cooked, fresh, frozen, or canned) are easy to transport and are nutritious! Convenient versions include bite-sized vegetables (think baby carrots or cut celery sticks), salads, wrap fillers, soups, and potato dishes.
- Meat and beans make great sandwiches or wraps with turkey, lean ham or roast beef, nut butter, fish (e.g., tuna, salmon), or hummus (chick pea spread/dip). They're hearty and complement most grains and vegetables.
- Dairy products like milk, yogurt, and cheese (e.g., string cheese, cottage cheese) make for portable lunch items high in calcium. Try incorporating low-fat versions with less or no added sugar. Calcium-fortified non-dairy products may also be an option.
- Oils and fats are part of a healthy diet, but use oils, fats, and their products (e.g., mayonnaise, butter, margarine, lard, animal fat, shortening) sparingly. Avoid trans-fat and limit the amount of food items high in oils and fats, such as some baked items (e.g., cookies, cakes), deep fried foods, and some packaged foods.
Suggestions for compiling easy and healthy lunches include:
- Make it a combo meal! Try incorporating three or more food groups into a meal. Focus on fruit, vary your vegetables, consume calcium-rich foods, and make half of your grains whole ones. A sample menu may be a whole wheat pita stuffed with chicken breast, hummus, and spinach with a side of a low-fat yogurt cup and an apple.
- Keep it simple. Whole, unprocessed ingredients make for easy preparation and high nutrition. Try having a sizeable stock of fruits, vegetables, nuts, beans, grains, and lean meats as basics for your lunch combinations.
- Limit sweets and fats. Try to limit food items high in added sugar and fats, such as soda, cookies, candy, some snack bars, and deep fried items.
- Make it up ahead of time. If you’re a top chef, make bigger batches of your famous dishes so that you can portion out meals for several days or freeze some for later use. Not a cook? No problem! Give wraps and salads a try.
- Rotate your menu. Doing this will ensure that you won't get bored of eating the same thing each day, and this may help you incorporate a full range of food groups.
- Remember: Safety first! Wash your hands while preparing and eating. Properly prepare your foods to appropriate temperatures before eating them. If you have access, store your lunch in appropriate temperatures to avoid having your food spoil. An insulated, reusable lunch bag with a reusable cold pack may help you keep your lunch safe and stay green!
For more information about creating a healthy lunch, check out ChooseMyPlate.gov for more tips and a personalized eating plan. You might also get your friends involved in the planning process. Ask them about their favorite quick and healthy lunches and trade ideas. These make for nutritious conversations and fruitful times with others. Bon appétit!
Dear What D'Ya Thinko About Ginkgo,
Gingko (Latin name, Ginkgo biloba) has been part of Chinese traditional medicine for thousands of years. It is extracted from the leaves of the hardy ginkgo biloba tree and is available in a variety of forms, including teas and tablets. Proponents of ginkgo believe that consuming the leaves increases cerebral blood flow and prevents the lumping of platelets in brain tissue. They also believe that ginkgo has other health benefits, such as slowing memory loss, improving cognitive ability, and curing conditions such as asthma, PMS, multiple sclerosis, and sexual dysfunction. For one herb, that's quite a resume!
While some claims on the Ginkgo plant may have some merit, not all are backed by research. Some studies have found that ginkgo biloba has positive effects on cognitive ability, though others have found that this may not be true. Ginkgo has been found to have possible antioxidant properties, which means that it may help the body fight free radicals. Free radicals in the brain attack healthy cells, stealing the cells' electrons. As an antioxidant, ingested ginkgo provides a target for these hungry cells, allowing them to steal ginkgo's electrons rather than from the healthy cells. Ginkgo has been found to be helpful in some patients with claudication (painful legs due to clogged arteries) and dementia. Despite these findings, more research is needed to establish ginkgo as the panacea that it's believed to be.
So, let's say you decide to ginkgo. You may be wondering about the recommended dose. For adults 18 and older, common dosage is typically around 80 to 240 mg, and may be taken two to three times a day (depending on the reason for use). It’s recommended that if you’re just starting to take ginkgo, it’s best to not take any more than 120 mg per day to avoid some gastrointestinal upset. Ginkgo might be safe for children, but it's probably a good idea not to give it to them unless it's under the strict supervision of a health care provider.
Ginkgo, though it is natural, may cause side effects, such as bleeding, headache, nausea, dizziness, diarrhea, and allergic reactions (some of which may be severe). Moreover, the U.S. Food and Drug Administration does not regulate ginkgo or other supplements. As such, it's recommended you ask your health care provider, if you are considering taking ginkgo, especially if you have a bleeding disorder or if you are taking any other medications/supplements. For more information about ginkgo, you may want to check out the section on supplements and ergonenic aids in the Go Ask Alice! Nutrition & Physical Activity archives.
Doing your homework on complementary and alternative medicine is a wise step to take — be proud of yourself for learning more info before you gink-go or gink-no.