Why am I still hungry after I eat?

If you've finished your lunch but it's barely touched the sides, it could be you're not eating enough real food.

Processed and high-sugar foods can cause a spike in insulin, sending hunger signals to your brain. Pick whole foods to keep insulin levels regulated and hunger pangs at bay.

Gallery: Clean up your diet!

Not sure where to start? Get to know the difference between natural and processed sugar:

Join Prevention's 21 Day Transformation Challenge to lose weight and feel great.