Hi Luppercue,
You can use olive oil, peanut butter, 1 egg yolk with egg whites, and peanut butter for fat. You will find fat in the meat that you consume as well. Here are some other sources of healthy fat:
Flaxseeds: 1 Tbsp has 37 calories and 3 grams of fat - you can sprinkle this on your salad, yogurt, cereal, oatmeal, and rice.
English Walnut halves: 14 halves (1 oz) has 185 calories and 18.5 grams of fat- you can have them on the side with your meal or add them to your food (salad, yogurt, cereals)
Almonds: 23 whole kernels (1 oz) have 164 calories and 14.4 grams of fat - you can have them on the side with your meal or add them to your food (salad, yogurt, cereals)
Avocado: ½ cup sliced has 117 calories and 10.7 grams of fat - you can use this in place of mayonnaise on sandwiches or add it to your salad. Here are more ideas http://www.avocado.org/.
Salmon: 3 oz has 175 calories and 10.5 grams of fat
Black Olives: 1 oz black olives has 66 calories and 5.7 grams of fat
Green Olives: 1 oz green olives has 41 calories and 4.4 grams of fat
Mackerel: 3 oz has 223 calories and 15.1 grams of fat
Let me know if you have any other questions,
Betty Kovacs, MS, RD