Make your lunch. Take your lunch.
This is a biggie and where most people put on the pounds.
Most of the things that are available in restaurants are just not very healthy. Even if you try, it's still a lot of calories and the pounds WILL add up.
It also can be challenging to order a salad when your coworkers are ordering bacon cheeseburgers. You will be healthier and save money if you make your lunch and take your lunch.
Disclosure: I make my own lunch each and every day. Takes 2-3 minutes. I'd be much larger in the waistline if I didn't do this.
Make your own dinner too.
Same story. The more you eat out, the larger your waistline will be - even with your best effort to eat healthy.
Cooking your own dinner at home does not have to be hard either. I start and finish in 15-30 minutes generally. Simple. Very tasty. Yum!
There are so many recipes online that can be prepared quickly and affordably.
You'll also be SAVING A LOT OF MONEY over the long term. It's expensive to eat out all the time. Even fast food garbage adds up to $$.