I seriously doubt ADD is a genuine disease of any kind, nor obesity or alcoholism.
I do think much of obesity is genetic, and thus we should be a bit compassionate about fat people. It’s not as simple as “eats too much” or “just don’t eat”. Many people seem to get naturally fat, and have terrible time losing weight. Because the opposite also exists (I was weight-deprived until I got elder). There are people who seem to sit on the fence, and either stay stable, or can turn on a dime their weight status (a cousin is another example).
There is an easy way to figure out what percent is genetic and what percent is environmental.
Look at the percentage of obese people during the Great Depression of nearly a hundred years ago.
The genetics were the same.
Obese people were very hard to find.
There's also suspicions that artificial ingredients in food alter the body's ability to process food, leading to obesity. It wasn't just television, computers, and a "sedentary lifestyle" that led to weight gain; something changed in the food.
https://www.diabetessciencenews.com/2019-10-21-propionate-can-increase-diabetes-and-obesity-risk.html
From the article at the link: "The supposedly “safe” food ingredient [proponiate] is a potential endocrine disruptor."
Artificial ingredients are also what's likely lowering levels of testosterone in men.
A.D.D. is on the autism spectrum. Male porn addicts are said to most likely have A.D.D. Obesity, especially those with morbid obesity tend to have either severe depression or anxiety. Both A.D.D. and obesity are linked with addiction, addictive behavior and depression and some theories suggest both are caused from early childhood trauma.
My nephew has ADD. Trust me, it’s a thing. His brain can’t hold onto any one thought process for an extended period, and he is constantly distracted, even when he’s really trying to sit and concentrate. Tell him something, he forgets five minutes later. This coupled with a stutter, too.
Obesity is 100% behavioral. I have a family member as an example - she knows what she eats is junk, but doesn’t care because she doesn’t have the time to cook or shop, nor the money to spend on healthier, more nutritious foods. She also very much enjoys food, and has a tendency to buy stuff that she really likes, and it’s just about always junk thanks to the chemical dependency on salt and sugar. She’s been heard saying that food is the last pleasure she has in life because her job dominates it, and she never gets to see friends. She works 12-16 hour days for a company contracted by the state of Illinois, but only gets paid for 8 because she has to bring her work home. Every. Day. They dump an insane amount on these particular workers and pay them jack sh¡t.