When we switch our main energy source to proteins and fats, we undergo fat adaptation. This is a metabolic state where our bodies learn to burn fuel from fat instead of carbohydrates and results in appetite suppression, allowing for progression to intermittent fasting. Autophagy kicks in at about 16 hours of fasting. 

When we switch our main energy source to proteins and fats, we undergo fat adaptation. This is a metabolic state where our bodies learn to burn fuel from fat instead of carbohydrates and results in appetite suppression, allowing for progression to intermittent fasting. Autophagy kicks in at about 16 hours of fasting. 

When we switch our main energy source to proteins and fats, we undergo fat adaptation. This is a metabolic state where our bodies learn to burn fuel from fat instead of carbohydrates and results in appetite suppression, allowing for progression to intermittent fasting. Autophagy kicks in at about 16 hours of fasting. 

When we switch our main energy source to proteins and fats, we undergo fat adaptation. This is a metabolic state where our bodies learn to burn fuel from fat instead of carbohydrates and results in appetite suppression, allowing for progression to intermittent fasting. Autophagy kicks in at about 16 hours of fasting. 

When we switch our main energy source to proteins and fats, we undergo fat adaptation. This is a metabolic state where our bodies learn to burn fuel from fat instead of carbohydrates and results in appetite suppression, allowing for progression to intermittent fasting. Autophagy kicks in at about 16 hours of fasting. 

When we switch our main energy source to proteins and fats, we undergo fat adaptation. This is a metabolic state where our bodies learn to burn fuel from fat instead of carbohydrates and results in appetite suppression, allowing for progression to intermittent fasting. Autophagy kicks in at about 16 hours of fasting. 

TCR involves swapping out foods high in carbohydrates and replacing them with proteins and healthy fats, which provide an alternative energy source. Examples of high carbohydrate-containing foods incude bread, pasta, rice, cereal, cakes, pastry, couscous, oats, quinoa, farro, barley, potatoes, and most fruits.

When we consume any form of carbohydrate, our glucose (sugar) levels rise. When glucose levels rise, this triggers the release of a hormone (chemical messenger) called insulin. Glucose can move freely into some cells; however other cells such as fat cells and muscle cells need insulin to unlock the transporters (gates) that allow glucose to enter these cells.

Macronutrients are the nutrients that we use for energy to sustain vital functions such as breathing and heart function. They also provide fuel for everyday activity such as walking.  Macronutrients are divided into carbohydrates, proteins and fats.

In our culture, dieters are taught to use willpower and self-deprivation. Failure to lose weight or maintain weight loss is associated with traits such as weakness, lack of self-control, poor will power, poor motivation and hopelessness. But hunger and metabolic rate are not under conscious control.

The World Health Organization (WHO) defines health as "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity".