If you baked something and people ate it, is it YOUR fault that they gained weight?

Adults are responsible for what they choose to consume. One person's lack of willpower isn't another person's "fault". Having said that, a considerate thing would be to avoid putting temptations in front of someone with low willpower (putting goodies in front of someone trying to lose weight is akin to blowing smoke in the face of someone trying to quit smoking). 

By your logic, McDonald's should be banned

As I always say. They cant gain weight if theyre dead. 

You sound like a brat. It's hard for a lot of people to Just not eat carbs. Grow up you sound like a child. I hate chefs.

I was once part of a company that makes snack foods possible. We discussed where to put vending machines on a college campus on the same day I set ant traps in my house. I noted something similar to someone like "doesn't it bug you that we likely are fully responsible for giving people heartatacks and killing them?"

Turns out, she used to be director of a healthcare clinic and yes, it does bother her. 

We both probably each ate 6 bags of free, expired cupcakes that day nonetheless. 

lol,...tell him he has to walk & eat it.

he shouldn't be eating those at all

id cook bake and do what you want..

bottom line he's an adult he can make a good choice.

By you philosophy, McDonald's should be banned for Littering. 

Bake what you want and take the goods to the local fire/police/hospital workers/ food banks/neighbors/relatives/old folks homes etc. 

You will need to contact the above and make sure they are willing to take baked goods.