As in nearly every aspect of my life, I took the opposite trajectory as most people. Most men are fit in their twenties, then get progressively fatter after that. Whereas in my case, I was 265 lbs in college at age 22, and 146 pounds now at age 36.

To illustrate the difference, I recently had my government driver's license renewed:

Left: my driver's license pic from 2014, at 235 lbs.
Right: my driver's license pic from 2018, at 146 lbs.

Losing the weight was easy: I just ate 1600 calories per day, and lost 80 lbs in 12 months. Piece of cake. Er, more like fewer pieces of cake. The hard part is now stopping the weight loss! Conservatively, I'm supposed to eat around 2200 calories to maintain my current weight, but that's an insanely gross amount of food compared to what I'm now accustomed.

So, my wife has helped me come up with healthy snacks to fill the calorie deficit. I think it will be sustainable; for example, here is what I'm eating right now, between meals: