I didn't have that experience when I lost weight at all, but is that 190 to 115 kgs or lbs because 190 seems a lot for kgs and 115 seems supremely under weight for lbs so either one of those seems like a major extreme. For me 190 lbs is just over my ideal weight (around 170 lbs I think is my ideal weight) and I'm not that tall.
When I lost weight though I used a calorie count website where I could not only count my calories but also the nutritional values and I made certain I was having all the necessary nutrients in my diet as best I could and not too much of the bad things, and started taking vitamins as well to help with that. That was the most important thing that made my diet successful and made me feel a hell of a lot better especially doing that going from a mostly cheese and bread based diet previously.