If you are overweight, no more than 30% of your total caloric intake should come from fats. If you decide to follow a fish oil diet, 20-40 fat calories would come from the supplements. But, research indicates that those calories must not count.
The study looked at the effects of adding 44 calories a day to an already overweight person's diet. Normally, that would cause a weight gain of about a pound every three months or so. But, the volunteers followed in the study did not gain weight.
There's more to learn if you want to follow a fish oil diet, including how to choose a good supplement. I have found the best value of fish oil product made from Hoki. A fish found in the deep water of the pristine ocean off the coast of New Zealand, that is naturally high in DHA and EPA for less than $20 a month.
Whatever product you buy the best fish oil is always pharmaceutical grade fish oil supplements because your health depends on it, so why not buy the very best? That's what I do.
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