How can I lose 15 lbs?

Nutrient dense foods. Eat foods that are nutrient dense (like meat, fish, poultry, eggs, cheese, low starch vegatables and water) avoid foods that are not nutrient dense (like starches and sugars, including fruit) nutrient dense foods will increase your basal metabolic rate. On the other hand, starches and sugars impair thyroid metabolism via affects on your liver (which helps activate thyroid hormone).
Diet and Exercise. Losing weight is all about diet and exercise. A well balanced diet is extremely important because you need to burn off more calories than you take in. Try limiting your calories and lifting lighter weights with lots of running and cardio exercises. Avoid sugars and simple starches because they make you hungry soon after eating. Foods with protein are better. Eat less. Eat less. Walk more.
Diet & exercise. Make sure you exercise at least 90 minutes a day, don't skip meals, avoid soda, juice, dairy, alcohol and fried foods. Eat a healthy well balanced diet! also water, organic vegetable broth, green leafy vegetables, natural pickles, apples are great to fill you up so you dont feel hungry and they are very low in calories.