Call me a cynic, but I'm guessing it's a bit more negative than a diet pancakes and bacon
I do not think that the diet of pancakes and bacon is very harmful. What is really harmful is a diet of highly processed food made largely of sugar and trans fats, not naturally occurring fat from animals.
I think that for years researchers have done intensive studies on all those things you listed. The fetal alcohol syndrome in babies of alcoholics is especially interesting.
There might be something to this study. My siblings and I all have stomach issues. Mom ate a farmer’s diet — but no alcohol, drugs, or smoking.