Following a fruitarian diet plan for weight gain is challenging due to the requirement of consuming a considerable amount of fruit to gain weight. Bodybuilders often consume large amounts of animal protein supplements to gain muscle, but the body cannot use protein itself. The amino acids found in protein are the essential nutrients that the body needs to build tissue. When one consumes animal protein, the body breaks it down into amino acids for absorption, which is the same for vegetable proteins. Fruits, however, are different because they contain protein that is easy to absorb in the form of amino acids, making it more efficient for the body to process and build new muscle tissue. Most fruits contain between 3% and 7% protein, with bananas, watermelon, oranges, and lemons having complete amino acid profiles, making them excellent for muscle growth.

To gain fruitarian muscle, one must work out regularly, such as through weightlifting, calisthenics, or yoga. The trick to muscle growth is to consume more calories than one burns. An app like Cronometer can help track how many calories one is burning and consuming. It is recommended to consume 0.8 grams of protein per pound of body weight to build muscle, but this ratio is often disputed. Fruitarian muscle building requires less protein because the body can easily use the amino acids in fruits, so less protein is wasted in the process.

The bodybuilding industry is young and highly profitable, with many people and businesses trying to make money. Selling protein supplements is a popular way to make extra cash, and advertisers have done a good job of brainwashing people into believing that protein is necessary for muscle growth. However, this is controversial, and many people have built fruitarian muscle without relying on protein supplements. Arnold Schwarzenegger is an example of a bodybuilder who used steroids, and fruitarian bodybuilding prioritizes health over muscle growth. The proof of fruitarian muscle growth is evident in the results of bodybuilders who have succeeded with this diet.