Q: I have heard that high heat destroys the healthy fats in nut oils;...
Answer :Youre correct that some nut oils have a low smoke point, the temperature at which they begin to burn. Unrefined walnut oil, for example, has a smoke point of only 320 degrees Fahrenheit, although refined walnut oil can go to about 400 degrees. Almond oil, by contrast, has a smoke point of 430 degrees. …
Q: I read the article How Safe Are Your Salad Greens? (December 2006 Healthletter)...
Answer :Nothing short of cooking will guarantee that E. coli on produce has been killed, but some research does suggest vinegar washing can reduce contamination of fresh produce. Research at the University of Nebraska led scientists there to recommend soaking produce in full-strength white vinegar for five minutes, stirring occasionally. Rinse with clean tap water to remove vinegar flavor. Wash only what you need immediately, as washing earlier could give remaining bacteria time to grow.…
Q: I have heard that the greatest nutritional value of the apple is in...
Answer :Jeffrey B. Blumberg, PhD, director of the Antioxidants Research Laboratory at Tufts Jean Mayer USDA Human Nutrition Research Center on Aging, replies, There is certainly nutritional value in apple skin, as it contains a variety of phytochemicals (phytonutrients), particularly flavonoids. This is the case for the skin of most fruits and vegetables, as these compounds are phytoalexins (compounds protecting the plant from environmental stresses, like UV light, molds and insects) and so need to…
Q: Which is fresher- vegetables canned soon after harvesting, frozen or so-called fresh as...
Answer :Theres no real scientific measure of freshness, but if you mean vegetables that are closest in nutrient content to freshly picked vegetables, the best bet is probably frozen produce. Alice H. Lichtenstein, DSc, Stanley N. Gershoff professor of nutrition science and policy at Tufts Friedman School, says, For the most part, frozen vegetables are processed close to the point of harvesting, and, unless thawed and refrozen prior to sale, should retain most of their…
Q: As a vegetarian, I am interested in the combination of fruits and vegetables...
Answer :Jeanne P. Goldberg, PhD, director of the Center on Nutrition Communication and the Nutrition Communication Program at Tufts Friedman School, answers, This is really not difficult. In general, vegetables and grains are better sources of protein than fruits. Single groups of plant foods typically do not contain all of the essential amino acids in the balance that the body needs them, but if you eat a variety you will get all you need. For…
Q: Is canned spinach just as good as fresh spinach to protect my vision?
Answer :Scientists believe that eating lutein, a nutrient found in green vegetables such as spinach, kale and broccoli, may help prevent eyesight deterioration. It is believed that lutein protects against cataracts and agerelated macular degeneration (AMD), both of which cause loss of vision. According to Allen Taylor, PhD, director of the Laboratory for Nutrition and Vision Research at Tufts Jean Mayer USDA Human Nutrition Research Center on Aging, the lutein content of spinach is not…
Q: We always have a bounty of fresh fruit-more than we can eat before...
Answer :Healthletter recipe consultant Patsy Jamieson replies: To freeze fresh fruit without sugar, peel and pit, if necessary, or rinse and pat dry. Slice or cut fruit into bite-sized pieces. Spread on a tray, cover and freeze until solid. Transfer to a plastic food storage bag, remove air from bag, seal and label. Freeze for up to eight months. To prevent peaches, bananas and mangos from turning brown, coat with lemon juice or an anti-browning…
Q: Everyone is singing the praises of fish oil nowadays, but I read that...
Answer:Alice H. Lichtenstein, DSc, director of the Cardiovascular Nutrition Laboratory at Tufts Jean Mayer Human Nutrition Research Center on Aging, explains that fish is beneficial because its an excellent source of the omega-3 fatty acids EPA and DHA. (For more on the benefits of omega-3s-and why other dietary sources such as walnuts and flaxseeds arent an efficient way to get EPA/DHA-see the July Special Report.) Fish and fish oil raise LDL cholesterol only in some…
Q: I keep reading that adding milk to tea interferes with its antioxidant activity....
Answer:Jeffrey Blumberg, PhD, director of Tufts HNRCA Antioxidants Research Laboratory, replies, I am unaware of any studies that have examined the effect of soy milk on the antioxidant activity of tea. However, the basic premise of this interaction is that the protein (mostly casein) in milk binds to the tea flavonoids, particularly the catechins, and thus inhibits their antioxidant capacity as well as bioavailability. As soy milk also contains substantial protein (albeit not casein), a…
Q: I enjoy Indian food very much and it appears very healthy, with many...
Answer :Ghee-clarified butter, with the milk solids removed-is made by heating unsalted butter to separate the milk solids from the pure butterfat. Although practitioners of Ayurvedic medicine in India claim that ghee has special health properties, some experts argue that the prevalence of ghee in Indian cuisine is actually a contributor to the high rates of heart disease in that country. In any case, Alice H. Lichtenstein, DSc, director of the Cardiovascular Nutrition Laboratory at…