Two amino acids whose carbon backbones are strictly ketogenic are:

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Ketogenic amino acids are those that can be converted into ketone bodies and/or can be used in the production of acetyl-CoA, which enters the citric acid cycle. Lysine and leucine are strictly ketogenic as they can only be degraded into acetyl-CoA and/or acetoacetyl-CoA, which are precursors for ketone body synthesis. Aspartate and alanine can also serve as substrates for gluconeogenesis and glutamate and glutamine are both glucogenic and ketogenic. Serine and threonine can be converted into glucose via gluconeogenesis and valine and cysteine can be glucogenic or ketogenic depending on the situation.

Two Amino Acids Whose Carbon Backbones Are Strictly Ketogenic Are