Fish oil and omega three fatty acids have been associated with numerous health benefits, including lowering blood triglycerides and reducing risk of heart disease as well as possible benefits for a huge range of illnesses from arthritis to stroke.
Ideally we should all include fish in our diets for health, but how does it fit into a calorie controlled weight loss diet and does the type of fish make a difference to weight loss?
Can a high intake of fish be beneficial for weight loss?
Studies have shown that as part of a calorie controlled weight loss diet, fish and fish oil can enhance weight loss. This may be due to the fact that fish is generally lower in calories than the red meat that it might replace in an average diet and that a larger quantity can be eaten for the same amount of calories, which may help to keep you fuller for longer.
Fish is also an excellent source of lean protein, a high intake of which is also thought to contribute to weight loss.
Omega 3 fatty acids from oily fish or fish oil supplementation have also been associated with better weight loss in a number of studies, so it can be concluded that fish can play a valuable part of a healthy weight loss diet.
It is important to remember, however, that in order to lose weight, a calorie restricted diet needs to be followed and introducing more fish into your diet alone will probably not lead to weight loss unless it is combined with such a diet.
See also: 10 best protein options for weight loss
Does the type of fish matter?
A 2007 study published in the International Journal of Obesity suggested that the type of fish was not particularly important when it came to enhanced weight loss.
The study in overweight males compared weight loss after following a calorie restricted diet over the course of four weeks. Four groups received the same amount of calories, but one group had a diet free of seafood, another with oily fish, the third with lean fish and the final group with fish oil supplements.
It was found that over the four weeks that the groups who ate both types of fish and the fish oil lost around one kg more than the seafood free group, suggesting that any type of fish may have some effect on weight loss when combined with an energy restricted diet.
Other studies have associated omega three fatty acids, which are more prevalent in oily fish, with weight loss; however, as these fish are generally higher in calories than lean fish, this may result in no real difference in effect.
Fish oil may also help with weight loss, however, eating the whole fish is probably preferable due to the extra nutrients that are present and the protein that can help with satiety levels.
What are the healthiest fish to eat?
The best fish to eat when it comes to health benefits can vary depending on where you are as different conditions can mean that the same species of fish have differing nutritional qualities.
It is also important, especially in terms of weight loss, to consider how a fish is prepared or cooked. Deep fried, battered or crumbed fish tend to be a lot higher in fat and calories than steamed, grilled or BBQ varieties, so try to choose healthier cooking methods where possible.
Popular fish generally considered to be amongst the healthiest
- Black cod or sable fish: These are an excellent source of omega three fats and also rich in the antioxidant selenium.
- Rainbow trout: These contain more than a day’s recommended serve of omega three fatty acids and are also a good source of vitamin B12 which is important for the health of the nervous system.
- Halibut: Once again, these contain almost an entire day’s worth of omega three fatty acids and are low in fat overall, making them a great choice for weight loss as the low fat content also means fewer calories. They are also high in potassium and vitamin D, but can be high in mercury and so consumption may need to be limited in high risk groups.
- Sardines, herrings and anchovies: These fish are all high in omega threes, whether they are fresh or canned. Canned varieties are an excellent way to incorporate more fish into your diet in a convenient and cheap manner.
References used in this article