I meant 83 kg, not 73.I was chubby once, about 73 kg and height of 180 cm.
I lost about 14 kg within a few months by doing a few simple things - stopped drinking any type of soda, no doughnuts, and switched from American fastfood to Asian.
Meaning, no hamburgers, fries or pizza. Instead I would buy any Asian (but not Chinese) foodcourt meals such as rice with meat and veggies, always refusing any extra sauce they would offer, this with a glass of water.
Within about 6 months I went from 73 kg to 69.