Its basically been proven as bullshit, physiologically if you are healthy its not true. There MAY be edge cases where if you are lacking the vitamins/minerals/essential fats necessary for hormone regulation it MAY in SOME people cause SOME irregularity but edge cases are just that.
https://pubmed.ncbi.nlm.nih.gov/19524224/
Its basically been proven as bullshit, physiologically if you are healthy its not true. There MAY be edge cases where if you are lacking the vitamins/minerals/essential fats necessary for hormone regulation it MAY in SOME people cause SOME irregularity but edge cases are just that.