The knives, muergos or fish knife, belong to the sort of bivalve molluscs, the Pharidae family. It is known them under that name by the form of his shell similar to the handle of a knife cuts.
Nutritional properties of the knives
Their main nutrient is the proteins of high quality (around 14%). They are poor in fats and hydrates, reason why its caloric value is very reduced, although of their little fats the majority is polyunsaturated, mainly Omega 3.
If we spoke of micronutrients, it is necessary to emphasize the B12 vitamin, potassium, phosphorus and sodium, as well as the iron, the selenium and, to a lesser extent, calcium and magnesium.
Nevertheless, everything is not good since, lamentably are also a source of dangerous substances if they eat in excess since they contain mercury, arsenic and nickel. It is necessary to observe that they would only be dangerous if they were consumed of very habitual way.
Benefits of the knives
On the other hand, also its consumption would be recommended for which they look for to prevent or to revert nutritional anemias, because the B12 vitamin can influence in this pathology.
The sportsmen also have them in their diets since they favor the corporal hydration and they contain a great variety of minerals. In fact, in old Greece, navas was used with therapeutic aims.
However, must be consumed with caution by hypertensive people or renal problems due to their high phosphorus and sodium content in.
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