Why are people so fat now compared to just 30 years ago?

Technology allows more people to sit and work (and eat).

Seed oils are a huge factor. They're in everything now.

Fast food is a scapegoat. People have always ate unhealthy. The reason is we are lazy as frick these days mainly due to the advancement of technology. These days you really don’t even have to leave your home to do whatever you want

Mosquitos.
Massive corporate farming with pesticides have killed many of their natural predators. The increase in mosquito population has cause a lot more people to stay inside cause the bug spray don't work. I'm rocking 50 percent deet and had to come inside cause I was getting attacked... This leads to people not spending as much time outdoors and thus getting fat.

Processed foods supplying a middle and lower class that get a lot of breaks and have access to more than ever.

Lack of willpower essentially.

1. Screen use in all of its forms.

2. Crap food that was more for special occasions or going out for once a week has become every day food.

3. I bet if you could measure it, people are drinking a lot more calories, which is a big factor for immobile people spending half their waking hours in front of a screen.

Duh, the Mississippi and Ohio Rivers are making us fat. Maps don't lie.

This is also happening, albeit to a lesser extent, in third world countries with less access to processed food and labor saving technology. In fact, studies have shown that a person today with the same diet and exercise habits of a person 30 years would still be fatter. There are several theories for this. I'm not sure which if any I buy.

Sedentary jobs and a culture of eating out instead of cooking.

High fructose corn syrup