I am 18 years old, 5'7", and 160 pounds. I have something coming up in 3 1/2 months, and for the past week I have been working out and eating better. For this reason, and for my own personal health, I would like to get down to 135 pounds. Is it realistic to lose 25 pounds in 3 1/2 months, naturally and saftely? Any tips are helpful, anything about eating tips or exercising. If this is not a safe and realistic goal I would also like to know. Thanks for anything!