That's a lot of weight lost in just a short period of time. Losing that much weight is life changing for the better. I was tired of the chronic back problems and doctor visits and in 2018 started walking to lose weight. My mentality was to burn more calories than I consume and with no special diet lost 40 lbs in two years. Have had zero back pain since and now I still walk to stay at my target weight. Went from 210 to 170 and have maintained that weight give or take a pound or two for the last five years.