Yes, mid-life weight gain here, too. My weight was creeping up, and a sudden spike of 5 pounds is what motivated me to do something about it.
I have never liked the idea of dieting or counting calories. I did a lot of research and came out following the whole-food, plant-based diet. I have also cut out wheat except while traveling, and then I choose pasta over bread.
It has been enormously successful. In 3 months I have
Dropped 23 pounds
dropped 3" from my waistline, back to where it had been for years
Immune system is stronger- have fought off a cold as if it were nothing
Have more energy than in 10 years
Want to and do excise mor (up to 4 miles walking a day)
No longer have cravings for carbs or sweets
Feel full longer and just don't need to snack
Aches in my knees are gone,
It's also fabulous for health - heart disease, diabetes, cancer prevention. I feel in control of my health!