My age is 24. height 5.4 .. weight 43 kg. it decreases to 40 sometimes bt doesn't increase even though i take healthy diet... suggest some cure...?

Based on the little: ...bit of info I have on you, i don't think you have a disease, so I can't suggest a cure. As long as you're eating a healthy diet, feeling good and maintaining a stable weight, consider yourself fortunate. Have you noticed that people tend to get heavier as they get older? If you have ANY symptoms that suggest a medical problem, please, do see a doctor. If not, enjoy your meals.