I am using fish oil capsules successfully! I take 5-6 1000 mg capsules twice a day combined with sugar water. This is working splendidly for me and I am losing weight.
Make sure it is Lachs oil (salmon oil) and get it from a very good source (to avoid mercury)- In 1976 my mother started giving me cod liver oil. It tasted disgusting, I remember being three years old ang gagging on it. But even back then she knew that cod liver oil is good for the brain. Cod Liver oil is not good for Shangri-La because of the high dose of Vitamen A in cod liver oil would give you an overdose of vitamen A and would cause side effects like peeling of the skin.
So use only high quality salmon oil.
Get 1000 mg capsules so that you do not have to swallow as much.
1 gram of oil (or 10 capsules) = 88 calories
And a comment about swallowing capsules: I find it much easier than mixing water in oil and drinking it, the "digust-factor" is not there.