What kind of meal frequency would you have?
3 meals spread out throughout the day, or a IF? I suppose IF'ing with 3 meals a day would prove difficult to gain weight due to eating big in such a short window as opposed to 3 big +1000 calories spread throughout the day.
The last several weeks I've been experimenting 2 or 3 meals a day.
For a long time I did 2 big meals, lunch and dinner, lately I've been doing 3 squares a day, 6 or 7 hours apart: I'm stuffed like heck and very slowly gaining weight. I don't even workout at all, just half hour walks if that.
Even with diary it's difficult for the scale to go up, goat or sheep cheese that is almost butterlike if you know the type (soft).