We won't come to have the same features, but won't our cells become similar?

Cells?

Tiny structures that build up living things. You and I are both made of collections of cells.

Hmmm...?

Every day, 0.5% to 2% of those cells die off and are reborn. Humans are made almost entirely of water and protein. Food replenishes that water and protein, so if we keep eating the same things all the time, our cells will come to be similar.

.... If you eat well and get plenty of sleep, you'll come to resemble me.

Oh, so that's it!