Fad n. : A hobby ; freak; whim.

Example:
What are some Fad diets that actually worked for you?

Taxonomy
FAD, flavin adenine dinucleotide, free encyclopedia, molecule, FADH2, Coenzyme, enzyme, riboflavin, reactions, citric acid cycle, vitamin B2, succinate dehydrogenase, B1, B3, B5, B6, B12, redox states.

Defination from the web:
FAD in eukaryotic metabolism are the citric acid cycle and the beta oxidation reaction pathways. ... vitamins: TPP / ThDP (B1) · FMN, FAD (B2) · NAD+, NADH, NADP+, NADPH (B3) · Coenzyme A (B5) · PLP / P5P (B6) · Biotin (B7) · THFA / H4FA, DHFA ...