You're strawmanning here. Parent commenter clearly meant healthy as in containing only "healthy" foods. If you eat 4,000 calories of brown rice, chicken and bro

You're strawmanning here. Parent commenter clearly meant healthy as in containing only "healthy" foods. If you eat 4,000 calories of brown rice, chicken and broccoli a day you will get fat. Colloquially, though, their diet would be called healthy because of it's constituent foods. Edit: you will get fat assuming you are like most people and do not expend greater than 4k calories / day in total