Wearable devices are also an option, but research shows that their results are unreliable. Online calculators, meanwhile, can tell you how many calories you expend each day, but it’s at best an approximation. For instance, there’s the “health halo” bias, which makes us more likely to underestimate calories in foods that are marketed as healthful. Unconscious biases can further skew our calorie estimates. For example, in a survey of 2,200 adults, consumers’ guesses about calories in popular restaurant foods ranging from pancakes to onion rings undershot the reality by an average of 165 calories. And according to research, these numbers are notoriously unreliable. The actual count, according to research, is 129-a sizable difference.Īccurate or not, calorie counts aren’t available for everything we eat, so we sometimes have to rely on our own estimates. As a result, the body doesn’t absorb all 170 calories. But this number doesn’t take into account the fact that almonds pass through the intestines partly undigested. Nutrition labels show them to have up to 170 calories per ounce. Listed calories may also be wrong because of the way our bodies digest certain foods. With ice cream, if you eat a cup (a normal amount) rather than 2/3 cup (the usual serving size), you could be getting as many as 325 calories instead of the 180 listed on the label. Making matters worse is the widespread problem of unrealistic serving sizes. That means, for example, that ice cream claiming to have 180 calories per serving may actually have 215. In fact, the Food and Drug Administration (FDA) allows numbers on nutrition labels to be off by as much as 20 percent, and usually the error is an undercount.
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