What does frequency mean in fitness

Which of the following is true of vegans?

Group of genes that encode molecules found in all body cells, creating a biochemical “fingerprint” that serves as the “id” for cells so that they are marked as “self” a) deoxyribonucleic acid (dna) b) entry inhibitors c) major histocompatibility complex (mhc) d) non-nucleoside reverse transcription inhibitors (nnrtis)

Petter is a middle aged overweight man who is trying to decrease his body circumstance . how could the serving size on a neutrino label him lose weight ?