How can I increase my intake without adding hugely to my portion sizes?
natural nut butter
starchy veg (sweet potatoes, carrots, butternut squash, white potatoes, turnip..etc)
full fat organic yogurt
grass fed meat
organic butter or ghee
dense/sugary fruit (melon, pineapple, banana...etc)
good quality dark chocolate
Cooking with olive, coconut and macadamia nut oils will help you up your calories without really increasing portion sizes. You can also use flax seed oil as a dressing to salad and steamed, grilled, broiled vegetables. You can also add sesame seeds to dishes and snack on higher calorie foods such as avocados, salmon, sardines, mackerel, olives, etc. Nuts and seeds will also help you increase your calories, healthfully.