The risks of using a high-protein diet long-term with carbohydrate restriction are still in the studies. Even though people will tell you the issue settles, and there is no harm, it appears to many researchers that several health problems may result if a high-protein diet follows for an extended time.
Problems With Proteins
Also, Collectively, virtually all of that expensive consumed protein becomes cheap glucose. However, Perhaps 20 grams per day of slow-digesting complete protein over the recommended RDA of 35–55 grams is sufficient for the highest permanent muscle growth rate that one is likely to see.
Additionally, huge humans can survive on a single kidney. It is also, unlikely that an average size human with two organs can damage them from consuming excess protein. Nitrogen must limit for those with already-damaged kidneys, but that damage almost always came from excessively high blood glucose and insulin. A low-carbohydrate diet would have prevented that even if it is was somewhat high in protein.
What Is Better? High-Protein Diet Or High Carbohydrate Diet?
What many consider to be a high-protein diet is a low-carbohydrate and high-fat diet. Such foods are healthier than SAD (standard American diet) in that they better avoid peaks in glucose and insulin. They provide some protection against NAFLD (non-alcoholic fatty liver disease), metabolic syndrome, and their progression to Type II diabetes.
Glucose and insulin bear far more responsibility for blood lipids and atherosclerosis than does animal fat, and diets with mostly vegetable fat avoid even that small risk. Foods that are not high in protein include the Mediterranean diet, the later DASH diet (which replaces carbohydrate with vegetable fats), and the MIND diet.
Right high-protein diets are typical among body-builders and are often abused. Their primary fault is converting high protein into cheap glucose when somewhat higher fat intake would have been better.
Animals have no other place to store amino acids except in temporary muscle. Regardless of one’s workouts and even of “chemical” assistance, tissue only grows at a limited rate.
Half of the amino acids liberates from consumed protein are converted into glucose in the first pass through the liver. Amino acids in vegetable proteins beyond what can incorporate into muscle also become glucose on succeeding passes through the liver.
Proteins such as whey, which provide pulses of amino acids over what muscles can utilize, also convert that excess into glucose. Even slow-digesting proteins such as meat, fish, egg, or cheese can do that in sufficient quantity but are less likely to do so.
Finally, those who are not on low-carbohydrate ketogenic diets primarily burn glucose and usually exhaust that reserve between meals. Humans do not immediately switch to burning fat but rather cannibalize that temporary muscle for amino acids, which the liver can convert into glucose.