Use smaller plates. This is a diet tip that has been floating around for years, and has probably be used about 100 million times. But you know why? Because it works. Using huge dinner plates is just an invitation to fill it with way more than you need. Using smaller plates forces you to take a more managable serving, and as long as you don't talk yourself into having seconds, you'll have instant portion control.

This doesn't mean you have to throw away your current plates and scour the nearest IKEA for smaller ones. Use the salad plates you have at home. Or a Bento box. Or a bowl. Or really, whatever keep you from packing away more than your share of food. Hint: this also works well at buffets!