To avoid starvation the body will lower leptin levels and lower energy expenditure in an attempt to slow down the rate of fat loss. As stated before, leptin is a primary fat burning hormone, low levels of it will spell disaster for any fat loss plan. There is a way to keep leptin levels elevated though. This can be accomplished through controlled high carb days. High carb days will keep leptin levels high and the metabolism running efficiently.
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.