Too much weight during pregnancy = more weight 15 years later

Well, it seems that all women tend to gain weight over time, but those who gain too much weight during pregnancy keep even more pounds on. A study out of Sweden showed that women who gained more than the recommended 25-35 pounds (healthy pre-pregnancy weight) or 15-25 pounds (overweight pre-pregnancy) had higher weights 15 years later than those who gained either the recommended amount or less. On average they weighed 22 pounds more than they did prior to pregnancy even 15 years later; those who gained the right amount during pregnancy still weighed about 15 pounds more 15 years later compared to pre-pregnancy weight.
It sounds bleak, but it doesn't have to be. During both of my pregnancies, I was concerned about gaining too much. So, I made a pretty big effort to eat close to the way I ate before I was pregnant. I would have an extra snack or two when I got hungry, but stuck to lowfat yogurt, nuts or a peanut butter and jelly sandwich. I also made sure to keep exercising, at a bit lower intensity. I gained about 20 pounds during each pregnancy and took it off within a month of giving birth. My boys were both a healthy 7 pounds 10 oz so for me it was the right amount to gain. I'm a big proponent of keeping the weight gain closer to the lower end of the range as much as you can. The key is to continue eating a good diet, exercising and listening to your body. Those are my tips. What worked for you?