Will I gain weight I ate 1000 calories today after 2 weeks of 600 calories per d!

I don't know how to tell you this, but you'll never see your toes again...

uhhhh....

Okay, I can tell you don't know how the human body works.

You are putting your body in starvation mode when you eat the wrong foods that don't have the right nutrients or if your calorie count is too low. I am guessing that you will gain weight because you are doing it all wrong.

Instead of starving yourself and eating cake, be full and eat the right things so you lose weight instead of gain it. Cake is full of fat and empty calories

Try a diet plan like this:
Breakfast: Oatmeal and tea
Snack: Medium sized piece of fruit
Lunch: Lean meat steamed veggies
Snack: Celery sticks
Dinner: Lean meat and steamed veggies
Snack: Almonds or other healthy snack

Don't go less than 1000 calories- EVER unless you want to gain weight.

You are fine the way you are. You can eat 2000 calories a day if you like, it all depends how many you burn up in a day through your actvities. If you are active you can burn up more than the 1000 so don't do such stuff as eating then making yourself toss it up.

Your skinny...you burn calories for being alive! Eat more and stop worrying.