Make a mental checklist of what you ate yesterday. Sure, you can probably remember breakfast, lunch, and dinner — but what about that mini Snickers you snatched from your coworker’s stash? Or that spoonful of mashed potatoes you took off your husband’s plate?

It’s easy to overlook bites, licks, and tastes (known as “BLTs” to professionals). But that’s a huge mistake — there are 25 calories, on average, in each mouthful. Translation: Six little bites a day add up to around 15 extra pounds a year.

“I remember one client who was keeping a diary and couldn’t understand why she wasn’t losing weight,” says Bethany Thayer, R.D., spokesperson for the American Dietetic Association. “We were discussing the problem when she took out a peppermint. I asked her how many she ate every day, and she said, ‘A bag.’ They’re nine calories each, but the whole bag is several hundred.”

Writing everything down can also help you make smarter food choices. If you often order a Starbucks Grande Dulce de Leche Latte, entering the data will bring you face-to-face with the fact that your beloved drink packs 440 calories, versus 23 calories for the same-size regular coffee with milk.