4. Which diet is the best for fast muscle building?
Whether Paleo, low carb, keto, or vegan, which diet you choose for muscle building doesn’t matter because the decisive factor is ultimately your calorie balance or the surplus.
But what you should know: If you also eat low carb on training days, this can impact your performance. On resting days, on the other hand, you can eat low carbohydrates more often.
So you like keto, you can try The Cyclic Ketogenic Diet.