At the beginning of the year I decided to cut out almost all my caffeine intake and try drinking more water while also doing meal preps for breakfast and lunch. I weighed 174 then. Today I weighed myself and I way 157, three days ago I weighed myself and I was 162. Should I be concerned at how fast I'm losing weight?

Note: I'm 5'8" dont exercise like I should. And dont eat as great as I could either.