From a comment on a post about diet tips:

I read a great quote on WebMD that said, “There’s a difference between indulgence and overindulgence.”

The whole thing:
15 Best Diet Tips Ever
By Kathleen M. Zelman, MPH, RD, LD
WebMD Weight Loss Clinic-Feature

I’ve been using many of them without having seen this list before.

The ones I use are:

Best Diet Tip No. 1: Drink plenty of water or other calorie-free beverages.
Best Diet Tip No. 2: Think about what you can add to your diet, not what you should take away.
Best Diet Tip No. 3: Consider whether you’re really hungry.
Best Diet Tip No. 5: Enjoy your favorite foods.
Best Diet Tip No. 6: Enjoy your treats away from home.
Best Diet Tip No. 7: Eat several mini-meals during the day.
Best Diet Tip No. 10: Stock your kitchen with healthy convenience foods.
Best Diet Tip No. 11: Order children’s portions at restaurants. (unfortunately, many places won’t allow this, so I have to settle for ordering sides, or stuff that keeps well so I can box half or more of it up, or share with someone)
Best Diet Tip No. 12: Eat foods in season.
Best Diet Tip No. 14: Use non-food alternatives to cope with stress. (Though this really ties into #3 for me – am I really hungry, or am I craving food out of stress/boredom?)
Best Diet Tip No. 15: Be physically active.

Read the whole article for hows & whys and for the rest of the tips.