Just eat everything in moderation. An occasional cookie or small piece of cake isn’t going to kill you. Look at what is on your plate and put 1/2 of it back. Don’t use a dinner plate, use a luncheon plate. Drink plenty of water ( not beer, coffee, or diet soda). Exercise, really exercise. A slow stroll around the park doesn’t count. Get that heart pumping. I’ve lost 20 pounds since I retired. At 70 years old I am 5 ft. 4 in. and weight 106 pounds.
At 73 I am six four barefoot, I weigh 240, my pants are size 36 waist and 34 length, my coat size is 52, I have the beginnings of a sixpack midriff, visible but not really defined. The bmi chart says I need to lose 52 pounds, that is absurd. Even if I add ten percent for what is certainly a large frame it still says I need to lose over 30 pounds. At age 68 I weighed 270, had a 54 inch chest and could curl 70 pound weights with one hand, young men looked at me in awe and told me they wanted to “grow up” to be like me. The BMI chart said I was “morbidly obese”.