40 lbs is a good goal, this can be achieved with some very simple diet changes and some light weight lifting with a little cardio. Eat more veggies and lean proteins like chicken or fish, and eat less sugary foods and breads, cutting out sodas would really help too. You don’t have to cut everything out, but try to eat more leafy greens and drink at least 100 oz of water a day. Send me a message if you’d like some more information on the fitness side! Good luck!