Look into hypochlorhydria/achlorhydria. Low stomach acids prevents the proper breakdown of protein and will allow pathogens to populate the digestive track. Bacteria will breakdown maldigested protein and release products that are condusive to Body Odor .
For example, muscle protein that is maldigested will serve as a meal for bacteria that will give off trimeythlamines. Also if you are supplementing with carnitine, protein rich supplements (ie whey) and have hypochlorhydria/dysbiosis (SIBO) you may simply be feeding dysbiosis since you may lack stomach acid/digestive enzymes to break it down (or simply just food rich in protein).
That's why many see good results by eliminating protein rich foods. HOWEVER this is not addressing the root cause and is simply taking away the foods that feed the bacteria that produce the waste that gives triggers Body Odor . You certainly need protein and eventually will become deficient (as many are due to lack of digestive juices).

You want to boost your digestive power so that you can nourish yourself and leave no residue behind that feeds pathogens.

Also lack of stomach acid will cause deficiencies in aminoacids and other metabolyte that may hinder proper ammonia detoxification like aspartic acid, cittruline, glutamine.

By making sure you have plenty of digestive juices you will balance your digestive track environment and naturally eliminate dysbiosis that may be triggering Body Odor . You also be able to obtain the nutrition from your food. Although the action of stomach acid will naturally normalize pH and slowly revert your condition, you may want to consider being more aggressive in resolving the pathogen overgrowth (specially bacteria since many species can still survive acidic medium) with natural Antibiotics like Colloidal Silver , olive leaf oregano oil. Obviously good quality probiotics (lactobacillus sporogenes being one of them) are mandatory to crowd the intestinal walls with healthy flora.

If the hypochlorhydria isnt resolved first though it will be very hard to accomplish this. Look into supplementing with betaine HCl during meals to break down the food, a If severly deficient in stomach acid, it can be very beneficial to supplement it between meals as well to normalize the pH in the gut - this can directly impact the overgrowth of pathogens. (you may want to use caution when taking on empty stomach as it may cause discomfort/warmth).

The problem with hypochlorhydria is that it lacks specific aminoacids and cofactors that are needed to produce the stomach acid. These need an acidic medium to be extracted and absorbed so it's like a vicious cycle that may need a boost of certain vitamins/mineral/aas to get out of it. Some things that may be behind it can be all B vitamins (specially niacin), lysine, histidine etc.

Mike