Eliminate cars.
Eliminate the options for people to be autonomous.
Pack everyone into major metropolitan cities by the millions.
Stop building houses.
Build Up.
Build condos and apartments.
Eliminate the option for people to buy land because it is unsustainable and the state knows better.
Sounds like a perfect dystopian society.
For most people: If Calories In > Calories Out, you're going to gain weight if you're consistently eating that way for long periods of time. It doesn't matter where your surplus of calories is coming from necessarily. However, a surplus of calories coming from carbohydrates is more likely than fat and/or protein for most people. Having said that, high fat intake + high carb intake is also common for many people, especially if you eat out.
Weight is only one factor though. Congestive heart disease and diabetes and cancer are the real risk, and there is a ton of evidence that simple sugars a drive the growth of these diseases.
This website is an echo chamber for holocaust deniers and other such paragons of empathy and humanity. I know this because a friend of mine recently mentioned how he started on this site because it claimed to be "censorship free" and when he checked back a (long) while later it was all extreme racism and other things like that.
In light of that, having and actively using an account here doesn't look good for you. Unless you're already actively tainted by this sort of thing or you happen to live in a country where this kind of behaviour is accepted (do those exist?).