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According to the World Cancer Research Fund (WCRF), 20 percent of all cancers diagnosed in the U.S. are related to poor dietary choices and lack of exercise. So what should we eat, and what should we avoid? News outlets and the internet are full of (sometimes conflicting) reports claiming links between specific foods or nutrients and cancer. Many of these claims are based on a limited number of studies. But when researchers analyze all of the research on cancer and nutrition together, it becomes clear that increasing intake of individual foods or popping dietary supplements doesnt work. Overall dietary pattern, however, can make an important and significant difference.

Q. I heard that the heat from cooking makes oil dangerous. Is oil safe to cook with?

Q. Ive heard that drinking lemon water can help with my acid reflux. Is this true?

Childhood obesity in the U.S. has more than tripled since the 1970s. According to the latest data from the Centers for Disease Control and Prevention, nearly 1 in 5 school-age children and young people (6 to 19 years) in the United States is classified as obese. Whats more, studies show that most children and adolescents dont meet dietary recommendations, and metabolic problems like diabetes and high blood pressure are showing up earlier than ever before. Eating healthier from a younger age can help prevent the onset of diet-related disease, says Renata Micha, PhD, a research associate professor at Tufts Friedman School of Nutrition Science and Policy who researches the impact of school food policies. Most of our eating habits are developed early in life. The sooner you start eating healthier, the greater the health benefits you will accrue over time.

When gathering together for a holiday, or any other group event, people may bring different dietary needs to the table. In addition to varying taste preferences, individuals may have dietary restrictions for medical, religious, or even moral reasons, or they could be following a particular plan they believe will support health or weight loss. Before undertaking preparing food for a group, it can be helpful to have a basic understanding of some of the most common dietary restrictions.

A recent study, published in The Journal of Nutrition, looked at nutrient and herbal supplement use in U.S. adults. The study surveyed over 3,400 people ages 60 and older between 2011 and 2014. About 70 percent of respondents reported using at least one dietary supplement over the previous 30 days, says study co-author Johanna Dwyer, DSc, RD, senior nutrition scientist with the Office of Dietary Supplements at the National Institutes of Health and director of the Frances Stern Nutrition Center at Tufts University. Older Americans may want to rethink this practice, however, since a growing number of studies have found that supplements may not have the intended health benefits. Additionally, more information is needed on potential interactions between supplements and prescription drugs.

A new report from the World Cancer Research Fund (WCRF) links obesity to 12 types of cancer. The report, Diet, Nutrition, Physical Activity and Cancer: a Global Perspective, analyzed a decade of research to develop cancer prevention recommendations. The analysis found strong evidence that being overweight or obese throughout adulthood increases risk of cancer of the mouth, esophagus, stomach, pancreas, gallbladder, liver, colon, breast (post menopause), ovaries, endometrium, prostate (advanced), and kidney.

Q. I heard flaxseeds can cause side effects. Should I stop eating them?

Q. I see carrageenan on the ingredient list of my organic almond milk. What is this, why do they add it, and is it safe?

Decades ago, TV commercials for Geritol cautioned viewers about iron-poor, tired blood, helping to create a misconception that if you feel worn-out and fatigued, you could reverse it by taking an iron supplement.