Please explain which food can i eat for weight gain if i'm kidney stone patient?

Anything: Old medical thinking is that since most kidneys stones are calcium oxalate, that you should avoid eating calcium and oxalic acid foods such as dairy and spinach respectively. This has been shown to be basically incorrect. There is more to the person who forms kidneys stones. Eat a balanced diet and don't over eat. Eat what you like or no diet will last.

Diet - kidney stone: The kidney stone healthy diet includes 4 liters of fluid per day, one liter of lemonade or 4 tablespoons of lemon extract, low protein - about 4-5 ounces per day, low salt, and high intake of fruit and some vegetables. Stay away from kale, spinach, chocolate, tea. To gain weight, eat grains, pasta, sauce, breads, colored vegetables, colored fruit.