The mnemonic
Leucine and Lysine: L and L
What each word stands for
- LLeucine
- LLysine
Why it matters clinically
They give acetyl-CoA or acetoacetate but cannot be converted to glucose.
Where it stops being reliable
Isoleucine, phenylalanine, tyrosine and tryptophan are both glucogenic and ketogenic.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.