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Track what you're eating. 2000-2500 calories a day shouldn't be enough for you to gain much, if any, weight even if you're completely sedentary beyond the gym. Try 40/40/20 Protein/Fat/Carbs or around there to start and track changes/progress, tweak as necessary for weight (muscle) gain or fat loss. Another factor- you're getting old. That's not a dig, as you're about my age. Fact is it takes more work and attention to detail at our age just to tread water than it would have 10-15 years ago to make serious changes. You want to make serious changes now you'll have to engage your OCD and work pretty hard at it. edited to clarify- that 40/40/20 is by calories, not grams or any other unit of weight.