I am a man and I can't eat more than 1500 calories per day. I feel so full after that threshold and because of that I am losing weight. What to do?

I used to be able to eat much more. I am active, as in I walk 10-20k steps per day, but I don't go to the gym. The only way I find myself eating more is by eating fast food that has a lot of monosodium glutamate, but even than I don't go above 1800 calories per day until I feel like exploding.

Can you please give me some ideas of what to eat in order to have more calories per day?

I am a man and I can't eat more than 1500 calories per day. I feel so full after that threshold and because of that I am losing weight. What to do?
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