How healthy are healthy fats? What if I get 250-300 grams of healthy fats per day in a 4000 to 5500 calorie diet? Can I eat more? For my skinny ass to gain weight, I try to drink lots of canola oil, which is basically just healthy fats. Can I drink like 400 gms of these fats a day or am I doomed to become fat, suffer from heart attack, or have gastric problems?