As an old guy I can say now's the time to do it. Like Jim I was diagnosed as diabetic a year or so ago and that's something nobody wants to hear. I'm not svelte these days but not back where I was either. What I found for me was the late night can of pop and snack was very bad. Shopping the outside of the grocery store is good - produce, meat, vegetables. Stay away from the center with all the processed and prepared foods. Eat lots of fish (never fried) and veggies.
My wife and kids made me stop losing weight after losing too much weight, I have to learn some middle ground approach.
___________
Chris in Florida