I know it's necessary to have a certain amount of fat in your diet, but occasionally I hear about "good fat" and "bad fat." What is the difference? Is that the same as saturated/unsaturated? What foods have "good fat"? Can I tell by looking at the nutrition label on a food product which kind of fat I'm eating?

Is chocolate bad for you?

I know how important it is to get plenty of fruits and vegetables in one's diet, but I've been finding it difficult ever since I moved out to do so. I live by myself, on a fixed income, and I can only grocery shop once a week. Whenever I buy fruits and vegetables, they end up going bad three or four days after I buy them, and I feel like I've wasted them. Do you have any advice on cheap, vitamin-rich fruits or vegetables that keep for a good long time? Thanks!

If you freeze yogurt does it kill the active cultures, the good bacteria?

Despite medication, diet control, and exercise, I still have a ratio problem regarding HDL/LDL. What foods would you suggest to boost HDL, while reducing LDL?

I've been trying to diet for over two years. My goal is to lose about 25 pounds, but the most I've been able to get is 15, and I can hardly keep it off. I concentrate on eating very little and since exercise is so hard to keep up, I pretty much starve myself to death. I manage to maintain the weight for a month, and then I lose control again. I've been thinking about the various diet products in the market, such as diet teas, herbs, meal- substitution shakes, and other medical products. I'd like to know what kind of side-effects they have, and how effective they are. (Some boast a seven-day plan, but that seems hardly believable.) Also, I'd like to know how well-researched the information is on these products (i.e., are they long-term enough to cover all the side-effects?) As for aspartame, is it really harmless, or is it just not researched yet?

How much calcium do college-age women need in order to avoid osteoporosis and other such problems in later life? What's the best way to get it? (Calcium, I mean, not osteoporosis.)