Are you overweight? Really, it’s very easy to get to 1500 calories in a day if you throw in some carbs and some calorie dense foods. Heck, right now mcdonalds is selling a $5 meal deal that’s 1200 calories. Eat that and 4 eggs for breakfast and you’re already at your calories for the day. A few slices of pizza can be 1000 calories. Just one small breakfast sausage patty is 150 calories. A big bowl of cereal with milk can be 500 calories.
None of that is really a healthy way to go, but all I’m saying that is people who need to lose weight usually have issues getting down to 1500 calories. Someone overweight but having a hard time getting up to 1500 in a day is pretty strange.
Regardless, if you just aren’t that hungry and need some healthy foods with a lot of calories, pecans and macadamia nuts are 200 calories an ounce. Full fat Greek yogurt is really calorie dense. So are things like peanut butter. Trail mix is also a great and really high calorie snack. Also, avocado. Really, there’s a lot of foods that are super calorie dense if you look for them. These are just some of the high calorie healthier ones.