Looking for an after-dinner snack? Try cereal -- it may help you lose weight, say American scientists. Of 58 overweight nighttime snackers, half ate a 150-calories bowl of cereal and low-fat milk at least 90 minutes after dinner; the others ate as usual. After four weeks, the cereal eaters had lost one kilo, and ate 140 calories less than usual after dinner. The others ate 85 calories more. The study was funded by the Kellogg Company, but the researchers say the type of cereal doesn't matter. What does: sticking to the serving size.