Skimp on fluids, and your body will release an antidiuretic hormone that leads to water retention that could affect the scale, Dr. Setlzer says. While this sneaky effect is one reason why the scale is a poor measure of body mass loss, you can outsmart it by drinking more—particularly if you fill your glass with water or non-calorie alternatives like unsweetened coffee and tea.
REALITY: Bro-scientists will insist that eating small portions every 2-3 hours will increase your metabolism. They base this on the thermic effect of food (TEF), which refers to the energy (calorie) cost of your body processing the food you consume. On average, 15 percent of the calories you consume are burned by processing them (although the rate varies by macronutrient). Someone took this idea and assumed that the more frequently people consume their meals, the more frequent TEF will take effect and thus increase fat oxidation.
The prevailing formula for a long time on how much fat you’re going to burn was calories in minus calories out, based on your basal metabolic rate (BMR) and exercise efforts, explains strength and performance specialist Joel Seedman, Ph.D., owner of Advanced Human Performance in Atlanta. But with all the different biochemical reactions in the body, hormonal response, and endocrine function, there are an infinite number of factors that can affect how your body is storing and breaking down calories.