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A healthy person needs 30 to 50 ounces of fluid per day.

More evidence that plant-based diets can help you stay healthy.

In particular, nuts and peanuts are getting attention for their heart benefits. A study published in JAMA Internal Medicine on March 2, 2015, found that among 72,000 Americans in the southern United States and 135,000 people in China, eating peanuts (a legume) and nuts (such as almonds and walnuts) was associated with a reduction of 17% to 21% in the risk of dying from any cause, especially heart disease. This study was not a randomized trial, and therefore it cannot prove that a regular diet of nuts has such positive health effects. However, two previous randomized trials did find that such a diet was heart-healthy. "Nuts and peanuts are rich in unsaturated fatty acids, known for reducing inflammation, improving blood vessel function, and lowering LDL cholesterol," says Debbie Krivitsky, director of clinical nutrition at the Cardiovascular Disease Prevention Center at Harvard-affiliated Massachusetts General Hospital. The American Heart Association recommends eating four servings of unsalted, unoiled nuts per week. A serving size is a small handful (1.5 ounces) of whole nuts or 2 tablespoons of nut butter.

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Don't be misled by well-intentioned advice. Some processed foods offer nutritional value and convenience.

Nutrition gurus often urge us to spurn processed foods in favor of whole ones. But not all processed foods are necessarily bad. "Most food needs to go through some sort of processing for it to even be edible and digestible," says Stacey Nelson, a registered dietitian and manager of clinical nutrition at Harvard-affiliated Massachusetts General Hospital. "The minute you cook something, you are processing it."

Substantial research proves the Mediterranean and DASH eating plans offer important health benefits for men.

If you feel run-down, lack of iron is probably not the cause. You can easily get enough of this key mineral in your diet.

Decades ago, advertising for the liquid vitamin and mineral supplement Geritol warned against "iron-poor, tired blood." It's a reference to the fact that red blood cells need iron to make hemoglobin, the molecule that grabs oxygen and transports it around the body.

Maintaining a healthy weight is the best way to rein in gastroesophageal reflux disease (GERD), or chronic heartburn, according to a study in The American Journal of Gastroenterology. Researchers found that GERD symptoms increased for every incremental rise in body mass index (BMI), which measures the ratio of weight to height.

In GERD, the acidic contents of the stomach back up into the lower esophagus, causing burning pain. The most effective treatment for GERD is taking an acid-reducing proton-pump inhibitor medication, such as omeprazole (Prilosec). People who are overweight are much more likely to develop GERD.

The new recommendations for healthy eating emphasize diet over individual nutrients and overturn some long-held beliefs.

Boosting your muscle mass may trigger changes that enhance heart health.

Munching a small handful every day may protect your heart.