cardinarky

OK, you want to lose 25 pounds. That translates to expending an additional 25(lb)x3500(cal/lb) = 87,500 cal over that which you eat during a 60 day time frame.
A sensible diet which you can live on and function cognitively would be about 1,800 calories a day. and you need to lose 87,500/60 = approximately 1450 calories a day to meet your goal.
You will be required to expend in aerobic and weight training, that amount if you eat a reasonable diet.
Running or walking will burn about 125 calories a pound. So if you can handle 8 miles a day, that would take care of 1025 of the calories. Now you will need a weight training program to lose the additional 425 calories each day.
The goal is possible but it will require an extreme dedication and effort to achieve. About 25 years ago, I did about the same thing and was successful.
My diet consisted of
Breakfast;
A double portion of real Old Fashioned Quaker Oatmeal, sweet and low for sweetener, coffee black, half a cantaloupe or a banana.
Snack:
Apple or banana or nectarine
Lunch:
A 7 oz can of water pack albacore tuna and all of the greens from a salad bar that I could eat. Lettuce, Broccoli, some onion, mushrooms, Then I used malt vinegar for the dressing. NO OIL
Dinner:
I/2 of a baked chicken.
1 large baked potato I used Frenches mustard to moisten the potato.
Snack; 1/2 Cantaloupe.
I know it works, (at least for me) because I have been there.
I also quit smoking two weeks before I set out on this program. So the theory that if you stop smoking, you will gain weight, also was dismissed.
Good Luck if you try it.