Your system uses different fuels differently. Carbohydrates yield 4 calories per gram. Protein has 4 per gram as well and fat 9 calories per gram. Some believe that all the carbohydrates are making them fat so they avoid the sweet potatoes, rice, whole grain bread, and the vegetables and fill their plates with meat. They think that protein is muscle food so the more they eat the better. A couple slices of bread may carry about 80 calories and the potato may have about 150 but the meat course with all the fat , maybe lamb steak, may equate to 1200 calories.
Protein’s main job is for growth and repair of body tissue. It develops the immune system and is involved in hormone and enzyme manufacture. Skin hair nails, muscles and blood need protein for maintenance and building. This does not mean the more the merrier.

Protein’s main job is for growth and repair of body tissue

The body uses protein in small amounts just for this purpose. It does not store protein for further use. Any excess is converted into fat. The nitrogen is removed in a process called deamination and the urea excreted. What remains is the Carbon. Hydrogen and Oxygen, the components of fat, and stored in those areas that you are trying to lose.
Fat in the diet is also an inferior fuel. A byproduct called Ketones will build up in the blood. We will discuss more on this in the next article. Focus on complex carbohydrates as your fuel.

The following article published by Everyday Health and written by Diana Rodriguez also Medically Reviewed by Kelly Kennedy, RDN ( Reviewed: April 29th, 2019), is titled Carbohydrates: Your Body’s Most Important Source Of Fuel. It gives a comprehensive view concerning the best fuel for your body. This is the link:

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