How many calories are in turkey with gravy and mash potatos and vegetables with butter?
That would depend on exactly how much of each thing you were eating, and which vegetables, how the turkey was cooked, etc. All those foods will have different caloric values depending on how they’re prepared and who much you eat. Nothing will inherently make you fat… eating too much of anything can make you fat. Tell your friend that as long as they exercise and eat things within reason, they’ll be fine. Exercise is really the key!