雅思阅读材料大集合：用微波炉热饭安全吗？

　　4Myth: Cut calories to lose weight

　　While cutting calories will likely help you drop a few pounds in the short term, Alyse Levine, a registered dietitian nutritionist and founder of the Eating Reset weight loss program, says if calorie restriction is your main focus, you’ll likely gain more weight in the long term.

　　“Everyone thinks weight loss is about what they are eating, but losing weight for the long run comes down to why and how you eat,” Levine said.

　　Rather than focusing on consuming a set number of calories a day, Levine advises her clients take a more holistic approach to weight loss.

　　“There are three very simple-sounding things I tell people to do to lose weight for the long run: Eat when you are physically hungry, choose whatever foods will satisfy you and stop when you are more than comfortably full," Levine said.

　　The problem with strict dieting is that it often forces you to ignore physical hunger cues, which can eventually lead to over-indulging. Levine’s philosophy gets you in touch with your physical hunger, creating a healthier dynamic for long-term weight loss.

　　5Myth: Dietary supplements are a waste of money

　　Recent recommendations by the U.S. Preventative Services Task Force indicate a lack of evidence that a daily multivitamin will ward off major diseases like cancer and heart disease. However, that doesn’t mean dietary supplements don’t play an important role in your overall wellness, particularly for certain groups of people.

　　“Some populations like women who are or may become pregnant, people with nutrient deficiencies or malabsorption problems, strict vegetarians or vegans, and older adults may need supplements to meet their increased needs,” said Caroline Kaufman, a registered dietician nutritionist based in Los Angeles.

　　If you choose to take a multivitamin, Kaufman recommends talking to your health care provider to determine the right type for you as needs vary depending on diet, health history, age and medical conditions. In addition, it’s important to look for quality brands that have been tested and verified by a third-party organization, such as the United States Pharmacopeia (USP).

　　6Myth: Microwaving food destroys nutrients

　　This is an old nutrition myth – recently reiterated comically by Jennifer Lawrence’s character in the movie American Hustle – but microwaving food does not destroy nutrients. In fact, according to Kaufman, in some cases microwaving food offers health benefits.

　　“A fast and convenient way to steam vegetables, microwaving can help people retain more water-soluble nutrients often lost when drowning vegetables in water and cooking them too long. Microwaving also helps preserve heat-sensitive nutrients like vitamin C due to a faster cook time,” Kaufman said.

　　In addition, partially cooking meat in the microwave means less cooking time over an open flame.

　　“Microwaving meat before pan-frying or grilling can substantially reduce the formation of potentially cancer-causing chemicals, caused heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), which cause cancer in animals, and may be linked to colorectal, pancreatic and prostate cancer in humans,” Kaufman advised.

　　7Myth: Coffee is dehydrating

　　A January 2014 study published in the journal PLOS ONE found that, contrary to popular belief, your morning cup of coffee will not dehydrate you. Researchers analyzed the hydration status of 50 male coffee-drinkers when they drank four mugs of coffee each day compared to when they drank four cups of water each day and found no difference between the two beverages.

　　While this is good news for coffee drinkers, Kaufman warns healthy adults should consume no more than 400 mg of caffeine a day -- that’s about 4 cups of brewed coffee, one "venti" Starbucks coffee or 10 cups of green tea. Consuming over 600 mg of caffeine each day is considered “too much” by the FDA because overdoses can be harmful and possibly lethal.

　　“While caffeinated beverages may help you meet your fluid requirements, in excess, caffeine can have negative effects on health like anxiety, agitation, headaches, insomnia, increased heart rate, dental caries, and more,” Kaufman said.