A study from Medical Hypotheses found that a low-methionine diet can increase longevity, especially when coupled with a low calorie diet, which is also proven to slow the aging process. However, it can be kind of hard to limit the intake of a specific amino acid.
UNLESS you’re a vegan, in which case, it’s pretty much a breeze.
I found this article really interesting from a nutritional standpoint, and I plan to use it as background information on the health benefits of a vegan diet.
McCarty, M. F., Barroso-Aranda, J., & Contreras, F. (2009). The low-methionine content of vegan diets may make methionine restriction feasible as a life extension strategy. Medical Hypotheses, 72(2), 125-128.