IMO, especially when one has snacks fully stocked, it's easy to 'forget' that you ate something.
One big breakthrough for me was reading Arnold S. "encyclopedia of body building". There's a lot of physiological tips and also very practical advice.
I'm sure you can get it from anywhere, but for me this was a big change. Sizing the reps, the workouts, the weights helped a lot in trying to make progress. Additionally endomorphic bodies need different excercise and I was doing too much ineffective cardio for months with few results.
Weights changed my results within a few weeks.