Tara Spencer

“The type of food you consume directly affects your metabolism and insulin response. Food is composed of three macronutrients: protein, carbohydrate, and fat, and each of these macronutrients affects your metabolism in a different way. One gram of protein or carbohydrate provides four calories, while one gram of fat contains nine calories. A calorie is the base unit of heat measurement related to metabolic rate. It measures how much energy a particular food provides to the body. Of course, if you do eat more calories than your body requires, it doesn’t matter whether those calories come from protein, carbohydrates, or fat—the extra fuel will be stored in the body as fat. Eating too few calories can be equally problematic. When you do not eat enough food, your body’s endocrine, immunological, and nervous systems begin to malfunction. The result is often hormonal imbalances, thyroid problems, and insulin resistance. When you are in a state of extreme caloric restriction, your body does everything possible to return to a state of homeostasis, or equilibrium—including slowing down your metabolic rate. A slow metabolism affects your energy levels, your digestive and hormonal health, and your ability to lose weight. In my case, severely restricting my calories increased my adrenal”
― Tara Spencer, The Insulin Resistance Diet Plan & Cookbook: Lose Weight, Manage PCOS, and Prevent Prediabetes