It is believed that simple sugars cause weight gain when in essence every food (even low GI carbs and proteins) will cause weight gain when consumed in large quantities that
result in caloric surplus.
Not exact matches
Consuming more protein than you need isn't harmful, but can
result in fat gain if it puts you
in a
caloric surplus.
That's why this is the
caloric surplus that will usually produce the best
results possible
in terms of maximizing muscle gains and minimizing fat gains for the majority of the population looking to build muscle.