Artesin saidNutritional value isnt really of any concern, my diet in general is near immaculate, but on a vegetarian diet its complicated to get 4k calories a day without going broke and without being chained to the kitchen. I was more interested in the idea of using high levels of fat and a moderate amount of protein to pad that count and get a running start out of the gate while finding out what some of the drawbacks could be. Which I doubt there really are any, considering its impossible for me to gain weight regardless of the circumstance.
Well it's a yes with a but.
Yes you can "pad out" your calorie count with fat if that is your last option.
It would be preferable to use another form of calories.
If you can maintain your weight at what it is while doing everything in the day that you do including working out, then that's awesome right there.
IF you want to increase your weight then you can eat any old thing and you will gain weight BUT if you are working out HARD and you give your body the things it needs to repair and build muscle (which I'm assuming you want) then find a cheap bulking shake and have that instead since it will provide your body with extra calories AND extra protein which your body will need.
and now for a however.
You could also buy a cheap tub of whey protein, mix it with milk, throw in a banana, some honey, a bit of peanut butter and stuff, it will increase your protein intake, your nutrient intake AND your calorie intake.