Age 62, 213lb - Best Procedure to Reduce Weight and Fat?

I am 62 years and overweight (97 kgs). My height is 5 feet and 5 inches only. Is there any medicines to reduce this overweight. I walk everyday for 20 min. I had naturopathy treatment where they do not give any food. They give some herbal juices (50 ml)and my weight reduced by 7 kgs within 10 days. This is the only treatment to reduce weight and fat?

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