Turns out that your liver can benefit from the sulphur-containing amino acids methionine and cysteine. Health benefits of amino acids such as these are excellent, but this is especially true for those with liver disease. As it turns out, those with chronic liver disease actually show a pattern of sulphur deficiency, so both cysteine and methionine may help with this.
Advanced liver disease and methionine / cysteine amino acids
In advanced or chronic liver disease, the metabolism of the sulphur-containing aminos, such as methionine and cysteine, are is impaired (no difference in the amino acid taurine, however).
In a study by P Almasio, G Bianchi, et al., at the Clinica Medica R, Università di Palermo, in Italy, the researchers published their discoveries based on 60 people who had chronic liver disease. The results show a pattern of amino acid deficiency in these patients.
10 of the subjects were used a control because they were healthy, but the other 50 patients had chronic liver disease, which was proven via biopsy.
The breakdown of their liver disease impairments
Hypermethioninemia (an extreme amount of methionine) was present in only these cases:
10 cases compensated cirrhosis
10 cases decompensated cirrhosis
Plus there were:
30 cases chronic hepatitis
The results of this clinical trial showed cysteine, a metabolite of methionine metabolism, was “markedly reduced in patients with compensated chronic liver disease, while in advanced cirrhosis its concentration was within the normal range.”
Methionine is an essential amino acid, which means you can only get it through diet, particularly protein foods such as meats (chicken, beef, pork, lamb, plus fish and eggs). Also, cysteine is a non-essential amino acid, which means the body can produce this amino acid on its own. No differences were observed (in plasma levels) for the amino acid taurine between groups.
What was observed was how sulfur-containing amino acid metabolism was deranged and “possibly located at various steps along the trans-sulphuration pathway, is also present in mild forms of chronic liver disease.”
What this means is that a key marker for those with chronic liver disease is that sulphur-containing amino acids are deficient. This can be true for people suffering from decompensated cirrhosis), or hepatitis.
The study did not explain whether supplementing intake with cysteine or methionine would affect the—chronic liver disease–patients in a positive way or not, but it is good to know that both of these amino acids are in ample amounts when associated with healthy livers, yet levels are abnormal in diseased livers.