Finding it hard to eat enough calories!

Never thought I would say that. But I am eating really clean, cut out all fast food and soda. I'm starting to think I might be under eating. I am 6'0 276 I have lost a little over 20 pounds in under a month. Is that too fast?? I do a lot of exercise because I love going to the gym. I lift three days on one day off every week and do cardio every day ( I burn 500 calories). I'm probably eating about 1600 calories a day. I don't really log on my fitness pal very much, usually I will just go on there to find out the macros and then I will write it down (old school way lol). I'm not hungry which is surprising to me. Any advice is greatly appreciated!

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