You may want to screw the cap back on that cola! It appears that there is an association between soda consumption and osteoporosis, as well as an association between soda consumption and markers for kidney disease in women who have a low to normal Body Mass Index (BMI). As with most foods and drinks, moderation is key to good health. A little information can go a long way, so keep on reading to learn more about these links.
Studies have shown an association between regular intake of colas that contain phosphoric acid and negative effects on the bone. Researchers hypothesize that a high level of phosphoric acid may lead the body to tap the bones for calcium to neutralize acids. Alternatively, researchers believe that osteoporosis could be a result of diet displacement — that is, heavy soda drinkers may not be drinking enough milk or fortified juices that are good sources of vitamin D and calcium. Just to note, the link between soda and osteoporosis was previously thought to be due to the carbonation in the soda — research has shown this association to be false.
As for kidney function, studies have found that women with low to normal BMIs who drink more than two cans of soda daily have about double the risk of developing albuminuria (the presence of the protein albumin in the urine) relative to those who don't drink that much soda. Albuminuria is a marker for developing early kidney disease. Researchers believe that this effect is more pronounced in low to normal weight women, because obesity already damages the kidneys and the extra damage from soda is likely to be less observable. It is unknown why the same effect is not seen in men. Additionally, studies have shown mixed results on the relationship between soda consumption and the development and recurrence of kidney stones.
In any case, reducing soda consumption can't be a bad thing. Not only are you playing it safe with regards to osteoporosis and kidney function, you're also avoiding a lot of extra calories and damage to your teeth. For tips on cutting down, check out Getting off colas, sodas, pop, fiz...oh, whatever!. Now raise your glass to better health!
May 18, 2012511344
A busy lifestyle and a rigorous semester may not always allow us to have fresh vegetables on hand. But, there are benefits and drawbacks of fresh, frozen, and canned vegetables. For starters, no matter which way you store it, a vegetable is always going to contain carbohydrates, protein, vitamins, minerals, fiber, and other plant chemicals, known as "phytochemicals," all of which are good for us no matter what. You’ll be happy to know that none of these nutrients are completely lost from processing.
While most people feel that fresh veggies are optimal, they may lose nutrients before they even get into your stomach. Raw vegetables lose some vitamins just by sitting around. It could take up to two weeks from the time they've been picked until they reach your plate. By this time, 10 to 50 percent of the less stable nutrients may have disappeared. Still, raw, lightly prepared, or minimally processed veggies (and fruits) often have a higher nutrient value than well-cooked ones. To help preserve the nutrient content of veggies (and fruits) during cooking or other preparation:
- Stick with shorter cooking times and lower temperatures (e.g., avoid deep frying)
- Cook with little or no water to help retain water-soluble vitamins, such as vitamin C and the B vitamins. For example, steam or microwave rather than boil. To limit exposure to heat when cooking this way, wait until the water is boiling before adding veggies.
- For more information, read Cooking veggies and vitamin loss?
Frozen and canned vegetables are often processed shortly after they are picked, so that nutrient losses would not occur during shipping, on the grocer's shelf, or in your home. Frozen vegetables actually retain a high proportion of their original nutrients. Sometimes, though, they are blanched (dipped in hot water), which preserves color and texture, but may compromise some vitamins. In order to avoid extra calories, salt, and/or fat, choose frozen vegetables without added sauces or cheese. Sodium is often added to canned products. A portion of this may be rinsed off with water, or you can choose the low sodium or no sodium that are often available (check the label!).
Whether fresh, frozen, or canned fits into your lifestyle, select any type that you'll enjoy eating. The number of servings needed in a day varies depending on your age and other factors, however, adults generally need about 2.5 to 3 cups of vegetables and 1.5 to 2 cups of fruit each day. Read Food Guidelines — How much is a serving? in the Go Ask Alice! Nutrition & Physical Activity archive for specific veggie and fruit serving size information. You can also check out Choosemyplate.gov for personalized recommendations.
As a side note, you may think that nutritional supplements are a quick and easy way of getting the nutrients you need in case you don't follow a healthy eating plan. However, a well-balanced diet rich in veggies and fruits can offer you much, much more than these supplements ever could, such as phytochemicals, which could protect against cancer, heart disease, other illnesses, and who knows what else? Beneficial substances such as these are found in vegetables no matter what form they are in.
A calorie is the standard unit for measuring energy released from energy-yielding nutrients, such as fat, protein, and carbohydrate. Fat is an essential nutrient that helps the body transport and absorb fat-soluble vitamins (e.g., A, D, E, and K), among other functions. Whereas proteins and carbohydrates have only four calories of energy per gram, fat has nine. Food labels are federally standardized to help make it easier for the consumer to know what's in a particular food. You can calculate the percentage of calories from fat by looking at the column marked "Percent Daily Value" for total fat and simply add up these percentages. It's recommended that fat make up no more than 30 percent of your daily diet (meaning less than or equal to 30 percent of total calories a day from fat).
Although it is important to watch both calories and fat grams, it's best to focus on the total number of calories consumed, which often seems to be forgotten. With the introduction of low-fat and fat-free versions of many common foods, you'd expect people to lose weight. Instead, many are either staying at the same weight or even gaining weight. Sometimes you can eat more of these foods than their full-fat versions for the same number of calories. However, sometimes low-fat foods contain more sugar than their full-fat cousins, and hence as many calories per serving. Ultimately, if you eat more calories than your body expends, regardless of whether these calories come from fat, protein, or carbohydrates, you will gain weight. Unused energy is converted and stored as excess body fat.
The amount of calories a person needs is based on body weight, age, gender and physical activity level. Generally, 1200 to 1400 calories per day is considered low, and anything above 2400 is considered too much. To find out how many calories you should be getting a day, check out the MyPlate website. This USDA-sponsored site will ask you to input your age, gender, weight, height and physical activity level in order to determine what caloric intake will be right for you. You can also check out Ideal Caloric Intake? in the Go Ask Alice! archives for more information on calorie counting.
Dear Joyful Juicer,
Juicers can be a great low calorie, high nutrient, tasty treat. However, they don’t generally carry all the benefits of eating the original fruit or veggie from whence it came.
If you've made juice, you know that it takes a lot of fruit to make a container of juice. Usually, juicers extract the juice and some pulp from fruits and/or vegetables. You’ll get all of the vitamins, minerals, beneficial plant chemicals (phytochemicals), and carbohydrates in juice that's extracted from a whole fruit. However, you won’t get much of the fiber, and depending on the fruit, you may not get any of it.
Fiber aids in the digestive process. It acts sort of like a scrub brush for your intestines and speeds up the movement of waste through your system. It also can fill you up, and may help protect against certain cancers. Fiber in fruit is found in the membranes between sections, the white part around the outside (as in oranges and grapefruits), the seeds, the skin, and the peels. For example, orange juice contains no fiber (even if it has pulp) because the fiber is found in the membrane, which is lost during the process of juicing.
It is also important to remember that juice is not a low calorie drink. An eight ounce glass of orange juice contains 110 calories — the equivalent of two oranges (each contains about 60 calories). But you won't feel as filled up from juice since it doesn't contain any fiber. For many people, drinking a caloric beverage, such as juice, isn't as satisfying as eating the same amount of calories in food. For those who need to increase caloric intake — such as athletes, children, or teens — juice is a great choice.
Fresh juice is certainly tasty and an excellent source of many nutrients. Less stable vitamins, such as vitamin C, are not compromised in fresh juice as they may be in some processed varieties. Also, watch for added sugar in many processed juices that can increase caloric content.
In general, juice is just fine. But if fiber’s what you’re after, go for the whole fruit or veggie over the liquefied form. Happy juicing!
Some people swear by Ginkgo biloba, calling it a miracle herb with the power to fix anything from Alzheimer's to erectile dysfunction. But what are the facts? Scientifically speaking the data is less clear.
According to available research, Ginkgo has been used effectively to improve cognitive function in patients with Alzheimer’s disease and dementia, as well as to improve memory in healthy adults and to treat peripheral vascular disease. Though it shows some potential with sexual dysfunction, the results have been mixed. In fact, Ginkgo’s effectiveness appears to be limited to relieving sexual dysfunction that is caused by selective serotonin reuptake inhibitors (SSRI) anti-depressants and not more generalized physiological causes. Some of ginkgo’s success with treating sexual dysfunction is believed to be the result of the placebo effect.
Though ginkgo is considered safe, there are some side effects such as headache, nausea, upset stomach, vomiting, and irritations around the mouth. Because of ginkgo’s ability to thin the blood, experts advise that you not take ginkgo if you are currently taking medication for diabetes, aspirin, ibuprofen or anticoagulant drugs such as heparin and warfarin. Doctors also advise caution to patients with bleeding disorders or those who are taking drugs, herbs (such as garlic, ginseng and red clover), or supplements that may increase the risk of bleeding.
Ginko biloba is usually sold as an extract because many of the plants parts, including its seeds, are considered poisonous and their consumption could lead to seizures and death. You may want to avoid these altogether.
Overall, Ginkgo could work for you either through the placebo effect or because of actual biochemical interactions — it just might not be your best bet. If you are interested in help with impotence you may want to speak with a health care provider. S/he can help you determine possible causes, the best treatment options, as well as answer any other questions you may have about Ginkgo biloba and its effects. Columbia students on the Morningside campus can make an appointment with Medical Services using Open Communicator or by calling 212-854-2284. Columbia students at the Medical Center can make an appointment with Student Health by calling 212-305-3400.
Dear Breakfast Boycotter,
Your brain (and central nervous system) run on glucose — that's the fuel you need to think, walk, talk, and carry on any and all activities. Let's say that the last time you eat something at night is at 10 or 11 PM (not optimal, just an example). The following day, you don't eat breakfast but wait until about noon or so to eat — you've gone thirteen or fourteen hours with nothing in your system. Your poor brain is surely deprived — and your body has to work extra hard to break down any stored carbohydrate or turn fat or protein into a usable form for your brain to function. That's a lot to ask for when you're sitting in a classroom, trying to concentrate on reading, or doing any other work. Eating breakfast has been proven (many times) to improve concentration, problem solving ability, mental performance, memory, and mood. You will certainly be at a disadvantage if your classmates have eaten breakfast and you've gone without. On average, they will think faster and clearer, and will have better recall than you. School or work can be tough enough without this extra added pressure.
Breakfast skippers also have a harder time fitting important nutrients into their diet. Many foods eaten at breakfast contain significant amounts of vitamins C and D, calcium, iron, and fiber.
Some people believe that skipping breakfast may help them lose weight. Not so! Skipping meals often leads to overeating later in the day. Becoming overhungry often leads to a lack of control and distorted satiety signals (meaning it's hard to determine when you're full). This can result in taking in more calories than if one had an appropriate breakfast. As a matter of fact, it's easier to control one's weight by eating smaller meals and snacks more frequently.
What if there's just no time in the morning to eat breakfast? There are plenty of items you can bring along with you to school or work. Carry a resealable bag of easy-to-eat whole grain cereal, or bring a yogurt or small box of skim milk, juice, or fruit. If you just can't stomach food in the morning, try to have a little something — such as some juice — and bring along a mid-morning snack. Other good portable items include: whole grain crackers, a hard boiled egg, cottage cheese, low-fat granola bars, or even a peanut butter sandwich. Single serving hot cereals, such as oatmeal, are handy — all you have to do is add hot water, available at most cafeterias or delis.
Whatever your choice, eat something. If you think you're doing fine with no breakfast, just try changing your tune for a week —you're likely to notice a difference. You will undoubtedly perform better with some fuel in your system, and, hopefully, become a breakfast believer.
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
Vitamin A is an essential, fat-soluble vitamin that has many diverse benefits for humans. Vitamin A promotes eyesight and helps us see in the dark; aids in the differentiation of cells of the skin (lining the outside of the body) and mucous membranes (linings inside of the body); helps the body fight off infection and sustain the immune system; and, supports growth and remodeling of bone. In addition, dietary vitamin A, in the form of beta carotene (an antioxidant), may help reduce your risk for certain cancers.
Adequate vitamin A intake is essential to human health. Vitamin A deficiency can lead to night blindness (inability to see in the dark or to recover sight quickly after being exposed to a flash of bright light in the dark) and xerophthalmia (progressive blindness that becomes irreversible if not treated in time with vitamin A).
Vitamin A deficiency can also reduce the health and integrity of skin and other epithelial tissues. The effect on skin can result in dry skin and hyperkeratosis (the development of clumps of skin around hair follicles). The effect on epithelial tissues can negatively affect the digestion and absorption of nutrients and cause infections of major systems and their organs (i.e., gastrointestinal, nervous/muscular, respiratory, and urogenital). In addition, bone growth can stop and normal bone remodeling can become impaired, resulting in anemia and weakened immunity.
The Recommended Dietary Allowance (RDA) for vitamin A is measured in retinol equivalents (RE), retinol being the active form of vitamin A. For adult men, the RDA is 900 micrograms of RE per day and for adult women it is 700 micrograms of RE per day.
Despite its benefits, too much Vitamin A can cause toxicity, the effects of which can vary depending on its source. Excessive intake of vitamin A in dietary form is not harmful, but will cause one's skin to turn yellow in color. In contrast, large dose supplements (10 - 15 times the RDA) of vitamin A (as retinol) is harmful, and could result in the development of a fatty liver (hepatomegaly), dry skin, nausea, vomiting, fatigue, weakness, headaches, anorexia, and/or possibly increase the risk of birth defects among pregnant women. Symptoms depend upon whether or not vitamin A intake was taken over a long period of time (chronic) or a single excessive dose at one point in time (acute). In general, fat-soluble vitamins should not be consumed in excess of the recommendations because, unlike water-soluble vitamins in which the excess is excreted out of the body, an excess of fat-soluble vitamins will be stored and accumulated in the body.
It is highly recommended that vitamin A be consumed in the diet rather than from supplements. The richest sources of dietary vitamin A are liver, fish liver oils, milk, milk products, butter, and eggs. Liver is an especially rich source because vitamin A is primarily stored in the liver of animals and humans. Vitamin A is also found in a variety of dark green and deep orange fruits and vegetables, such as carrots, sweet potatoes, pumpkin, spinach, butternut squash, turnip greens, bok choy, mustard greens, and romaine lettuce. Beta carotene is the most active carotenoid (the red, orange, and yellow pigments) form of vitamin A. In addition, cooking (but not overcooking) increases the bioavailability of carotenoids in plant foods and absorption of dietary vitamin A is improved when consumed along with some fat in the same meal.
Hope this helps,
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,
Dear Confused and College Bound,
You are not alone with your concerns. Going to college is a big step in a person's life involving major changes. You and those around you may be living on your own for the first time, making decisions on a buffet of issues, including what to eat.
Eating healthy at college is possible. Many college dining services are offering more healthy choices and are often quite receptive to students' concerns and dietary preferences. But, this is only part of the challenge. In an environment where time, friends, and finances may combine in new ways, having options available only solves some of the puzzle. It's important to experiment with what works best for you. For example, that traditional idea of three square meals a day has been updated with a more contemporary concept of eating five smaller meals spread throughout the day. Steer clear of diets or fads, especially those that drastically limit a particular nutrient. Remember, balance, moderation, and variety win out over trendy and extreme. For some practical tips, navigate through the many options on Choosemyplate.gov. Columbia students can also take advantage of the resources from the Get Balanced initiative. Plan ahead when possible so you don't have to rely on vending machines when you're hungry; think of ways to incorporate fruits, vegetables, and whole grains on a daily basis. Eating more of these will fill you up and possibly even enhance your already stellar brain power.
Making time for physical activity is important, too. Most college fitness centers have a variety of movement classes and options. When the weather is right, grab a friend and walk, run, bike, or blade outdoors. If you are Columbia affiliated, you can connect with the CU Move initiative. CU Move encourages members of the Columbia community to engage in active lives that include regular physical activity. The program provides participants with motivation, incentives to be active throughout the year, and event calendars with access to plenty of free and low-cost physical activity options on campus and around NYC.
Now, to address the second part of your question: an eating disorder, such as anorexia nervosa, is less about food, eating, and body weight. It has more to do with mental health, emotional, physical, socio-cultural, and family issues. If this is a particular concern of yours, you might want to take a look at Eating disorders vs. normal eating. Additionally, if you are a Columbia student, you can make an appointment with a health care provider or a registered dietitian to discuss your concerns by contacting Medical Services (Morningside) or the Student Health Service (CUMC).
Give yourself some time to adjust to a new environment and ask for help when you need it. Everything in moderation, even moderation.
Enjoy your time at college,