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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.

Consumption of ultraprocessed foods is associated with greater risk of cancer, according to new research study in the BMJ. This is the first study that specifically links highly processed foods to cancer.

Getting older brings significant changes-in where you live, how you live and with whom you live. New health conditions and age-related changes in the body can affect how well you absorb certain nutrients and the amounts you may need. Although you cant stop time, you can control what you eat.

A large umbrella review of 218 studies on coffee and health found that people who drink 3 to 4 cups a day are at lower risk of a range of diseases and conditions, says a study in The BMJ. The umbrella review combined the results of 218 meta-analyses, each of which combined findings from multiple studies. These studies of studies included 17 with randomized clinical trials, which-compared to observational studies-produce stronger evidence that coffee may directly reduce the risk of certain diseases.

Q. Some creams, dietary supplements and even teas say they can protect or rejuvenate the skin. Is there anything to this at all?

Q. Colon cancer runs in my family, so I want to do everything I can to lower my risk. Ive heard that taking extra calcium can help. Is this true?

Plants are prolific chemical factories. They continuously produce thousands of compounds called phytochemicals. These chemicals perform vital functions for the plants, and some are noxious or even poisonous. But some plant chemicals are helpful to humans when consumed in foods, such as fruits, vegetables, plant oils, and whole grains. Perhaps not surprisingly, these same foods are part of the healthy eating pattern outlined in the 2015-2020 Dietary Guidelines for Americans. Part of the reason why eating patterns based on whole foods are healthy may be their anti-inflammatory properties.