Some info to consider
The main way your body is powered is via aerobic respiration which, through a complicated process, takes glucose (sugar) and oxygen and turns them into energy (ATP), water, and carbon dioxide (this is why we need to breathe in oxygen and breathe out CO2).
Your body can take building blocks from any type of food and use it to make glucose (this happens in the liver)
However, unless you are on the Atkins diet or have not had a meal in a day or so, probably most of the glucose in your body comes from carbohydrates in your diet. Your body can take any carbohydrate and break it down more or less directly to glucose.
Proteins and fats, on the other hand, must be broken down and then rebuilt into glucose (it is "easier" for your body to use carbs for energy). Plus, your body's cells are constantly growing and dividing and producing hormones, etc., and they need amino acids and fatty acids to do so. Thus the proteins and fats you eat are more likely to be broken down and used for these purposes. These are more or less the theories behind high-protein, low-carb diets.
When your body is carb-depleted, it is forced to use fat and protein for energy. This may cause you to lose weight, but is not the way your body is meant to work and thus can be dangerous. It can lead to a condition called ketosis (which can cause nausea, dehydration, headaches, light-headedness, irritability, bad breath, and kidney problems), and also causes loss of muscle mass. Plus, the high fat and cholesterol content and low-fiber content of these diets can lead to heart and digestive problems.
Maybe "moderation in all things" would be a sensible compromise.
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