wie viel protein pro tag muskelaufbau — what symptoms are typical?

The question about optimal protein intake for muscle building and typical symptoms is not directly addressed by the provided context. In general, sports nutrition recommends 1.6–2.2 g of protein per kg of body weight daily for muscle gain, depending on training intensity and goals. Symptoms of insufficient protein include muscle loss, fatigue, slow recovery, and weakened immunity. Excessive protein (above 2.5 g/kg) is rarely harmful in healthy individuals but may cause digestive issues. The evidence for these recommendations is strong (human-strong), but it comes from established nutrition science, not from the given context. The provided context covers STI tests, fatigue, microbiome, and DNA tests, with no mention of protein or related symptoms. Therefore, this answer is based on general knowledge, not the cited sources.