Protein, every life must exist.
The body needs a lot of nutrition, which comes from food.
Your skin is made up of the nutrients in these foods.
Your friend only knows Jamlom's nutrition knowledge (protein).
What I want to tell you is that besides protein, the body needs many kinds of nutrients.
Just because you pay attention to your food doesn't mean that your diet and nutrition are balanced and appropriate.
A lot of knowledge, unconsciously, maybe you don't even know that you are wrong.
Learn about nutrients when you have time. It might help you.