"When you eat more protein than your body needs to replace and repair body parts, excess protein is largely converted into glucose and burned as fuel. It turns you into a sugar maker and sugar burner! This is not desirable or healthy."
Looks simple to me, and fits with experience.
I think that upon close examination, you'll find that somewhere around 58% of ALL protein eaten is conveted into glucose. The rate of conversion seems to depend on the source of the protein. Plant proteins convert at a different rate than animal protiens. This has brought me to the conclusion (which could be wrong) that certain amino acids are converted and others are not. Plant proteins have a significantly different amino acid profile than animal proteins and this would account for the different conversion rates.
There are also body systems that require glucose. If you don't provide a diet dietary source, then the body will shred muscle and other lean tissue to create it. Glucose is not a bad thing. Excessive glucose is. Even if you eat lots of protein, you'll find that your BG curve rises slowly and seldom elevates more than 25 to 30 points after eating a meal. Eating any significant amount of carbs at a meal will often cause BG to rapidly shoot up 100 points or more causing an massive insulin reaction.
In my experience eating too much food is far more an issue than the fat/protein ratio of the food. I was surprised to find that overindulgence in fat would also cause BG to rise, and kept fasting levels of BG 10 to 15 points higher throughout the day than lower fat higher protein meals. Many others have found this to be true for them as well.
The easiest way to keep BG low is to eat a diet very low in carbs, and then eat just enough food to satisfy your body's needs. Any more than that will cause fasting BG levels to rise and you will slowly accumulate body fat. Wish it weren't so, but that is my experinece.
Lex
Lex