In your horoscope we see that your ascendant is Sagittarius and Jupiter the lord of expansion aspects the lagan. Jupiter aspects on lagan increases weight and size.
Sagittarius people are very focused and it is in the sign, once they decide they always do it. Therefore you should really think about how you can loose your weight. You are right too much weight not only is bad for health of the self but also does not let you enjoy life to the fullest.
If possible you should join some weight loss program. Better still if you can do it yourself. Go for walk minimum 2 times daily. Eat less fatty stuff. Eat more fruits, soup etc. It may be uncomfortable for few days initially but then once you see the change you will yourself never want to regain weight.
If you dont do then in 2021 your mahadasha of Jupiter will start which will see you getting more weight. Therefore it is better to stop this increase now.
Blessings,
Navneet Khanna
Astrologer