That is a claim that would require a study to confirm. No such study has been done to my knowledge.
Here is the first one I am aware of: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3050654/. So 14 years of evidence backing up this claim.
Edit: on the premise that the environment is crucial for the outcome. This means creating a safe comfortable environment. Maybe with these new drugs will show otherwise in time.
Anyone asking either doesn't have any or needs help.