For example, in my university (which pretends to be very progressive and conscious), you can get all sorts of unhealthy snacks and highly sugary/caffeinated drinks throughout the campus. It’s very convenient and much easier than getting water (for which you have to bring your own cups or bottles) and healthy food (which is expensive, only served at particular times and limited in portion so it doesn’t make you feel full).

Calorie counting, mate. Since I began doing that I have achieved the ability to cut 2 kg of weight per month at will, even when spending most of my life at a campus like the one you describe.