I calculated and i should be eating 1000 calories per day, 400 from carbohydrates and 500 from fat
Sounds all over place that.
500 Fat calories, and 400 Carbs, so bascially 100 calories of protein, or 25g a day.
The minimum daily Protein requirement for Women is 45g a day. I assume you're a male, which means your Protein requirement could be very bad on a daily level, when you eat less than a sedentary woman should, with no adequate long-term Amino Acid yield.
1000 calories a day, is also too low. For a male bearing in mind you'd need to do some exercise to get "washboard Abs", well unless you wanted weak Abs you could see, not kind of plumped up cut ones, I'd be aiming for at least 2,000 a day.
This is how you could do that.
40% Protein, (200g, 800 calories), 30% Carbs, (150g, 600 calories), 30% Fats, (65g approx, 600 calories).
Breaks down over a 6 meal plan, as 30-35g Protein per meal, 25g Carbs per meal, 11g approx Fats.
You might be keeping Carbs a bit lower than you might be expecting, but then you would hopefully be using some of the Fats you ate, to use for energy.
Be aware, to get these reatios spot on each meal, is hard as nails. You might find Fats are a gram over, or Protein is a couple of grams lower, it's what happens, but as long as you're mostly in the ballpark, you're getting close or around the target.
If you need more calories, up that to 2,500 and go with approximately the same ratios.