An easy way to keep yourself from putting on unwanted pounds? Cook your own meals. It's very difficult to eat healthy at restaurants. Their portions are always too large. And you have no control over their ingredients. One study found that when people eat out they consume on average 500 more calories compared to when they eat at home. Those calories add up quickly.
So start using the stove. (In case you've forgotten, it's that piece of equipment in your house right below the thing you cook your popcorn in.)