Welcome to HCM,
Your question is simple and answer is management of overweight
and Obesity is long term and complex as it requires lifestyle changes.
Your height is 170cm so your weight is 107 kg if we calculate BMI it is more than 35 which is grade II obesity.
You need a medical checkup to rule out any medical checkup to rule out hormone or Thyroid
issues.There are no short cuts in this.
Main treatment for obesity consists of dieting and physical exercise.
Low calories diet may produce weight loss
over the short term, maintaining weight loss is difficult and often requires making exercise and a lower food energy diet lifestyle.
Aerobic exercises, such as cycling, swimming, walking, running.
Taking low calories and low fat diet , please understand a deficit of 3500 Kcal causes weight loss of 500 Gm/day.
If you exercise and take care of diet then there are few medicine available to help like Orlistat
which you will get through prescription.
Other effective treatment for obesity is bariatric surgery
. you have to see specialist surgeon for this and discuss.
Please take care