Just asking out of curiosity, is it theoretically possible to gain more weight than the weight of the food you ate?
There's 453.59 grams in a pound and fat has 9 cal / gram, so a pound of pure fat would have 4,082.3 calories.
So in theory, if you ate 3500 calories of PURE fat over your TDEE, you'd actually gain more weight than the fat you ate...
~3,500 calorie surplus = 1 pound fat gain
3,500 calories / 9 cal per gram = 388.89 grams of fat eaten
388.89 g / 453.59 = 85.7% of a pound eaten
So you'd eat 85.7% of a pound of pure fat and gain a pound of body weight?