Q. How are multivitamins made and how do the vitamins get into the body...
A. Brittany Loriquet, a dietetic intern in Tufts Frances Stern Nutrition Center, explains: Vitamins can be derived from food products or produced synthetically in a lab. Most multivitamins are made from synthetic vitamins, which are cheaper and easier to use than those from natural foods. There is no difference in the chemical structure between the synthetic form and naturally derived forms. To make a multivitamin, the vitamins and minerals are ground into a fine powder. …
Q. Is brown spaghetti higher in vitamins and other nutrients than regular white spaghetti,...
A. Lisa Massini, a dietetic intern at Tufts Frances Stern Nutrition Center, answers: Whole-grain pasta is naturally darker than white refined pasta due to the bran (the hard, fibrous outer layer of a grain) that it contains. This color difference is not due to added colors. Whole-grain pasta contains a significantly larger amount of fiber than white pasta (6 grams per serving versus 2 grams serving). It is also richer in iron and magnesium; however,…
Q. Ive read numerous articles about the benefits of drinking coffee; however, none of...
A. Jeffrey B. Blumberg, PhD, director of Tufts HNRCA Antioxidants Research Laboratory, replies: Casein, the protein in cows milk, does bind to chlorogenic acids, the principal bioactive constituents of coffee (other than caffeine). Depending on the amount of milk added to the coffee, this may decrease the absorption of chlorogenic acids into the body, although its ultimate impact on antioxidant activity or other actions is not clear. There do not appear to be any human…
Q. I enjoyed your Special Report on food-drug and supplement-drug interactions (May), which states...
A. Our source for this information was the National Library of Medicines MedlinePlus, which explains: Warfarin (Coumadin) is used to slow blood clotting. There are several reports showing that taking glucosamine hydrochloride with or without chondroitin increases the effect of warfarin (Coumadin) on blood clotting. This can cause bruising and bleeding that can be serious. Dont take glucosamine hydrochloride if you are taking warfarin (Coumadin).…
Q. Do you have any information regarding the prickly pear cactus and claims that...
A. Erika Hval, a dietetic intern at Tufts Frances Stern Nutrition Center, answers: The prickly pear cactus, sometimes referred to as the cactus pear (Optunia spp.), has been touted for a variety of health-related benefits from treating diabetes to alleviating alcohol-induced hangover symptoms. Found in Mediterranean and subtropical African and American zones, cactus pear plants are characterized by flattened stems (cladodes) and brightly colored, sweet-tasting fruits. In general, the stems supply high amounts of pectin…
Q. In purchasing frozen fruits and vegetables, does it matter how far the produce...
A. Alice H. Lichtenstein, DSc, Gershoff Professorof Nutrition Science and Policy at TuftsFriedman School, answers, To my knowledgethere are no data available on this topic.However, freeze/thawing cycles significantlydecrease the quality of the product. Hence,it is in the producers and purveyors interestto maintain high quality, and thus to avoidtemperature changes. The bottom line is thatproperly stored frozen fruits from other countriesshould be fine.…
Q. When considering the health benefits of peanuts, should they be viewed as legumes...
A. Jeffrey Blumberg, PhD, director of TuftsHNRCA Antioxidants Research Laboratory,replies: Though a legume by botanical classification,the nutrient profile of whole peanuts(including the skin) is more similar to tree nutsthan other legumes. For example, peanuts area good source of monounsaturated fat, niacinand vitamin E, and contain fiber, protein andminerals like magnesium and copper. Thoughmore fat calories may be absorbed from peanutbutter than from the matrix of the whole peanut,it too provides these healthful nutrientsexcept the antioxidant…
Q. I have raisins in my oatmeal every morning for breakfast, with milk. Now...
A. Diane McKay, PhD, a scientist in Tufts HNRCAAntioxidant Nutrition Laboratory, answers:The amount of iron in 1/4 cup of raisins is onlyabout 1 milligram, too little to interfere with theabsorption of the 300 milligrams of calcium presentin 1 cup of milk. If anything, the amount ofcalcium in this meal might inhibit the absorptionof some, but not all, of the iron from the raisins. However, if your body is low in either mineral,it will adjust by…
Q. Is there a difference in healthy eating between whole wheat and whole grain,...
A. Nicola McKeown, PhD, director of TuftsNutritional Epidemiology Program, explains:Whole grains include many different grains,such as wheat, corn, rice, oats, barley, quinoa,sorghum, spelt and rye. These grains are calledwhole if they are not milled into refined grainversions. For instance, whole wheat bread is awhole grain food, but if a bread label states onlywheat bread it is, in fact, NOT a whole grain butrather a refined wheat product. Labels typicallywill not include the word refined to…
Q. My physician tells me that I am pre-diabetic, so I am very careful...
A. Ashley Abbott, a dietetic intern at Tufts FrancesStern Nutrition Center, replies: Artificialsweeteners are low-calorie sweeteners that willnot raise your blood sugar. Artificial sweetenersare considered free foods because they contain kless than 20 calories and less than 5 grams of carbohydrateon a diabetes exchange. They can beused in place of sugar to provide a lower-calorie,lower-carbohydrate food or beverage.Artificial sweeteners may be useful in bloodsugar and weight control because they are muchsweeter than regular sugar, so…