I really struggle to loose weight. my problem is i have sprained both my ankles to many times. and if i try jogging or gym my ankles starts paining.

No carb biking.: Ease up on the jogging and start riding a stationary or regular bicycle. You might also start seriously cutting the carbohydrate intake.

Diet and execise: I can understand that you have hard time exercising .While you are recovering from your sprained ankles,you can still follow the diet to loose weight which is very important.Depending on how much you weigh.what your BMI is and what your eating habits are will determine what and how many calories you should consume in your diet.Consult a Dietitian along with your doctor,Diet and Exercise to resume

Exercise not needed: The key to losing weight is not a temporary diet but permanent changes. Sugars and simple carbs from grains esp. cause weight gain. Avoid fried foods. I like Dr. Furhman's diet: http://tinyurl.com/ktampgg Dr. Weil has useful info: http://tinyurl.com/m8avwzh See his "discuss that" link. See https://tinyurl.com/ya3fqtc8 You can lose weight without exercising. Also get checked for hypothyroidism.

Weight: Diet is actually more important than exercise for weight loss. Ask your doc about a low carb food plan and ask about upper body exercise such as light dumbbells. This will help w/bone strength as well. Peace and good health.