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Don't count on green-tea pills to help you lose weight or keep your bones strong. A new clinical trial testing year-long supplementation of green-tea extract reports no difference between the pills and placebo in changes in body mass index, total fat mass or percentage of body fat, or bone-mineral density.

Q. I keep reading about the health benefits of spicy peppers, but I can't eat spicy foods. Is there any way I can get these benefits without eating hot peppers?

Every cell in your body needs water to function. Water transports nutrients and oxygen throughout the body, and carries away waste materials. Water makes up most of your body, ranging from about 75% of body weight in infancy to 55% of body weight at older ages. Your brain and heart are almost three-quarters water, your muscles and kidneys are almost 80% water, and even your bones are about 30% water.

Q. Are the nitrates/nitrites in celery juice, used in some processed meat products, really safer than products containing regular additives?

Q. Can you tell me if instant coffee confers the same health benefits as brewed coffee?

A dietary pattern high in vegetables and fruits such as carrots, pumpkin, sweet potatoes, peppers, cantaloupe and dark leafy greens might help protect you against breast cancer. According to a new analysis of data from the European Prospective Investigation into Cancer and Nutrition study, women with higher blood levels of alpha- and beta-carotene were significantly less likely to have breast cancer.

Q. Does kombucha tea really have any health benefits, as I keep hearing about?

Q. How do the nutrition and probiotic benefits of kefir compare with those of Greek yogurt?

Two new studies add to the evidence that led the latest Dietary Guidelines for Americans to recommend restricting intake of added sugars, nearly half of which in US diets come from sugar-sweetened beverages.

[IMGCAP(1)] Earlier this year, the federal government released the new Dietary Guidelines for Americans (DGAs). (See our March Special Report.) As a cardiologist, public-health advocate and nutrition scientist, I see a lot of good in the DGAs. First, the DGAs emphasize healthful eating patterns and foods. This is an advance over past guidelines, which focused more on isolated nutrient targets. Modern nutrition science tells us that, for preventing major diseases like obesity, diabetes, heart disease and cancers, its…