Does anyone have any suggestions of foods that are high in fat but low in calories? I have a challenging time staying below the calorie range but getting the fat content high enough. I have to eat about 18 grams of fat for lunch and dinner and I often have to resort to peanut butter. I would love any suggestions!! 

 i keep almonds and stuff around.  you really can't eat a lot of them but i they are a good way to get the fat up.  each almond is about 0.8 g fat, 6 calories.  I am talking about raw almonds, not roasted or anything like that.

 I have the same problem. Like the previous person I also add almonds to a meal just so I reach the fat count. Another good choice is avocado. 1/2 avocado (100 g) has 160 kcal and 15 g of fat. And as a bonus it also has 7 g of fiber. You can have a sandwich with 1/4 avocado spread on each side and sprouts in the middle.  One other suggestion is to add 1 oz of ground flaxseeds to cereal or smoothies. They add 150 kcal and 12 g fat and 8 g fiber. And one more suggestion is to blend a mango with water (2 cups plus a few icecubes) and 2 cups of fresh spinach and add 1 tbsp of flaxseed oil (110 cal 11 g fat) or coconut oil (120 cal 14 g fat) to it. Both oils taste delicious and the mango has about 165 cal and 1 gram of fat per 100 grams of fruit. That mango/spinach smoothie tastes delicious without the oil and I usually have it that way as a snack without the alli pill. Good luck to you and I hope lots of other people leave suggestions because I'm running out of ideas myself.

String cheese is another good snack that is higher in fat and lower in calories.  I can always use extra calcium too!  A 12 oz. string cheese has 80 calories and 6g of fat.

 Great ideas...I do the avocado and peanut butter and also the almonds....I need more things to add as well...

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 Olive oil added to low or fat free dressings or on grilled veggies. Healthy fat and easy to control the portion size. One teaspoon is about 5 g fat. 2% cottage cheese, reduced fat peanut butter, hulled sunflower seeds or olives on a salad,dip made from light sour cream and dry ranch mix. Walnuts or pecans added to hot oatmeal or cold cereal.Reduced fat (not fat free) cheeses.