Julia Child was asked about eating healthy and maintaining weight.
This list is from the American Institute of Wine and Food, co-founded by Julia Child:

Moderation
Small Helpings
A Great Variety of Foods
No Snacking
Weight Watching
Sensible Exercise
Have A Good Time!

I think this is the list to live by. It very simply says, no bags, no boxes, don’t obsess and eat home cooked food. Enjoy every bite!!!