> I essentially eat a nice sized lunch and no other real meals. I drink a protein shake with some peanut butter and a banana for breakfast and a soylent drink for dinner.

A breakfast is a meal. And the way you describe it, it can easily be upwards of 600 calories. Peanut butter is one of the most calorie dense foods on the planet and bananas add up very quickly in terms of calories.

Also iirc, a bottle of soylent is 400 calories, which is not insignificant.

So all in all, you still probably consume ~2000 calories, which is enough to lose weight, but also enough not to feel hungry by timing the consumption correctly. Small-framed women, for example would gain weight with the same diet.

> I'm not sure if I'm just now gaining the will power to stick to a diet

I wonder what is HN's obsession with sticking to specific diets? Generally speaking there is an infinite number of possible healthy diets that get you your macros at every calorie level.