What is the best method to loose your weight? and how to maintain my weight?

I used to be 130kgs but after doing gym and jogging i lost 63kgs in 2 years. But After I joined in a Job i was not able to do any exercise so gained again 25 kgs in 1 and half years. So my question is should i take any medicine or again start gym or only jogging will do any good?
Jogging
Yoga
Medicines
Exercises on abs
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+1 y
Please if preferring medicines mention the brand name.
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+1 y
hey any diet food i. e easily available in market?
What is the best method to loose your weight? and how to maintain my weight?
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