[keymone]

important to note that amount of calories you burn is heavily affected by chosen diet. as you start consuming less, your body responds by lowering temperature, reducing your willingness to move and think, etc, all of which reduce calorie burn, so you may think you're in deficit when you're not.

[ljm]

It's important to keep active, possibly more active than you normally are. Make it a lifestyle choice so you can replace old habits.

Remaining fully sedentary and running a 1000 calorie deficit isn't maintaining a diet, it's starving yourself. You'll get the weight back as soon as you call the diet a success and go back to your 'default' lifestyle.

(This of course doesn't apply to everyone: medical reasons, disability, etc.)