![]() ![]() If you feel bummed like the day you learned Santa wasn’t real, turn that frown upside down. So when you’re figuring out the calories you need for weight loss, TEF is already accounted for. Besides TEF, the other components are resting metabolic rate (RMR – calories burned at rest, lying down, and practically sleeping) and also daily exercise/daily living activities (deliberate exercise or normal activities like house cleaning). The other reason food can’t take credit for “negative calories” is that TEF is included in the calculations that estimate a person’s energy needs – total metabolism. Because of their fiber content, veggies have a higher thermic effect at 20% of calories consumed, but it still doesn’t pass 100% so it can’t have negative calories. So a 1,500 calorie day uses 150 calories to digest and store food. Instead, you estimate it based on all the calories for the day. You really don’t calculate it for individual foods. ![]() However, the TEF is generally estimated about 10% of all calories consumed. ![]() In other words, you put energy in (burn calories) to get energy out (calories available from digested food). TEF represents the energy expenditure above resting metabolism that contributes to digestion and storage of food. The Thermic Effect of Food (TEF) is the reason for the whole “negative calories” concept. While it is true that digesting food burns calories, it is not true that any food has negative calories. So the theory goes that there are foods that provide negative calories, presumably because the calories it takes to digest the foods are greater than the calories in the food. Have you heard celery and grapefruit called “negative calorie foods” and wondered if it was just a myth or actually true? Read on to find out the facts about this dieter’s phenomenon. ![]()
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