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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.

There seems to be no limit to the promises on the Internet for foods and dietary supplements that allegedly boost or support your immune function. Theres more than a grain of scientific truth in it, and the prospect of enhancing immune function with nutrition is a busy area of research-some of it by scientists at Tufts Human Nutrition Research Center on Aging (HNRCA) and Friedman School of Nutrition Science and Policy.

Q Do nut butters have the same nutritional value and health benefits as raw and roasted nuts?

Excluding skin cancers, colorectal cancer is the third most common cancer diagnosed in the US, with 140,000 new cases forecast for 2018. Research has linked dietary factors to colorectal cancer risk. Processed meats are associated with higher risk, whereas high-fiber diets are associated with lower risk, although it is unclear how this happens.

When people resolve to eat better, one of the first things they think of is to start eating more salads. After all, the structure of a great salad is built on vegetables, particularly leafy greens. Vegetables, along with fruits, are the foundation of healthy eating patterns, as emphasized by the 2015-2020 Dietary Guidelines for Americans. For a 2,000-calorie diet, the Guidelines recommend the equivalent of about 5 cups of vegetables and fruits per day.