3 basic food components
Proteins. Composed of 22 amino-acids of which 9 are essential amino acids. Those 9 essentials amino acids can’t be made up by the human body and need to be ingested.
Fats. Made up mainly of fatty acids. 2 of them are essentials for the body and need to be ingested.
Carbohydrates. All of the usable ones for the body can be made up by the body from amino-acids and fatty acids through a process known as gluconeogenesis.
Carbohydrates need insulin to be used by the cells. Whenever we ingest carbohydrates we produce insulin for our cells to absorb and use them. Insulin also transform excess carbohydrates into fat.
This energy can be looked at as basic energy and on demand energy.
The basic energy is the one we spend to survive lying in bed, breathing and our heart pumping and undergoing the basic physiological functions.
The on demand energy is the one we need on top of the basic energy whenever we enter in other activities such as walking, running, having sex and all the other activities we entertain.
The human brain consumes about 500 kcal a day, never resting even when we are asleep, being able to use carbohydrates without the need for insulin. This energy consumption represents about a quarter of the basic energy we need daily.
Those muscle cells are found mainly in our muscles but also in every other organs such as the walls of our blood vessels, the walls of our gut, our heart etc.
Another interesting fact is that 80% of the neurons, the nervous cells composing our nervous system encased in our skull are busy with muscle movements’ control.
Humans are made to move and we need to take care of our muscles.
Either we eat it or we eat our body in waiting to replenish it by getting food.
Proteins and carbohydrates bring 4 kcal per gram. Fat brings 9 kcal per gram.
Carbohydrates are readily available in our blood as blood sugar. But we need to maintain a minimal blood sugar level to avoid hypoglycemia. So we use gluconeogenesis to elevate our blood sugar level.
To do that we use our proteins and our fats. Fat is a good reserve of energy but its use is slow. The main reason being that it is poorly vascularized. So the body uses its muscles because they are plenty and very well vascularized.
The less muscles we have the less ability for carbohydrates production and the less reserve.
Fatigue sets in and its vicious circle of less exercise and more fatigue.