So just a little bit of back story, my wife and I started walking every morning in January as a semi New Years resolution to get healthier. I went to the doctor in February because my knees were giving me trouble. When I weighed in, I was shocked to see 400 lbs. on the scale. I was expecting 330, maybe 340. That scared the hell out of me. Went home and started researching diets.
As far as diet, on 2/26 we started keto. That went a long way to help teach us portion control and how to actually keep track of what we were eating.
In July we started doing intermittent fasting. We were basically doing a 5/2 split, usually fasting on Tuesdays and Thursdays. That also worked very well, and felt a little more normal than strict keto.
At this point we are doing a hybrid between calorie in calorie out / low carb / intermittent fasting / one meal a day, basically just mixing it up based on what we have going on that day between our schedules, kids schedules, etc. but making sure we maintain a calorie deficit when you look at the week as a whole.
As far as exercise, at the beginning of the year my wife and I started walking every morning. At first it was just a lap or two around the block. As we lost weight and started feeling better, we progressed to jogging, then running, then started to mix in some calisthenics. Right now alternating days between cardio and calisthenics, trying to do at least 5, sometimes 6 days a week.
My wife has gone from ~200 lbs down to 135 lbs during that same time frame.
Started the year wearing 3XLT shirts and 44 waist pants, currently in LT shirts and size 34 pants. I don't know women's clothes sizes that well, but my wife has basically gone from xl down to small and medium. It was all fun and games when a bunch of older stuff started to fit again, but now we're at a point where none of our clothes fit. We are basically having to buy a whole new wardrobe. Guess it's a better problem than the opposite end of the spectrum, but a huge expense none the less.