You know mackerel are rich in omega-3 fatty acids, but they are also a great source of iron, zinc, and protein. Protein is responsible for maintaining the health of your cellular structures, muscles, enzymes, and even your immune system. Many animal-based foods are high in fat and calories making it difficult to cut calories while ensuring you ingest your recommended daily allowance. Mackerel are exceptional as a protein source. A 100-gram serving has 305 calories and has 25 fat grams.
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