Hello. You have also mentioned kidney stones in your medical history. If you have recurring kidney stones , then try to avoid milk and milk products like thick curds. Switch to plain buttermilk (1 spoon curd in 1 glass water). If your height and weight mentioned above is correct - you’re not underweight, you just need muscle mass gain.

Yes you can have curd. There is no problem in taking curd and milk but that should be low in fat. For weight gain you can consult and take a customised diet plan.

Having low fat curd is ok for both. Make sure you avoid bakery products. Include good fruits and vegetables and start some basic physical exercise. Contact me on Practo online consultation for further details.