You need to lose weight.

NEWYORKER: Baptizing the Gun

If you want to lose weight, you need to develop a new, psychologically sustainable relationship with food that can carry you for years and years.

FORBES: Sustainable Weight Loss: Minding What Matters

Finally, in order to lose 15 pounds in 30 days, at your height, weight and age, you would need to reach a 1750 calorie deficit every day.

CNN: Is it possible to lose 15 pounds in one month?