It depends. My bf has gained about 20 lbs, but it's mostly through habits.
He does all the cooking, and when I began fattening him I made an effort to keep him with food as much as possible - he takes cooking classes, and started cooking from a dessert cookbook. Since he has no willpower around sweets, it was easy for him to make one dessert per week and finish it.
Also I told him to stop leaving leftovers. Leftovers MUST be consumed. Go out once a week, order many dishes, and tell your feedee they need to eat them.
Fattening someone or feeding them is not just about money and dining, it's about habits. What are their weaknesses? Eroding portion control, changing their habits and expectations are all very effective.
6 years
