Answer:
Sardines are not not good as they lack nutrient, stored in can with preservatives and also may lead of mercury bio magnification in case of prolonged and continuous consumption.
Explanation:
Sardines are the most perishable variety of fish which means that without preservatives in a can these fishes cannot be preserved for long time.
Sardines are consumed because of low mercury content in them as they feed on planktons but due to the use of preservatives in canned fish packages, food and health association do not recommend consumption of sardines.
Also, minute quantity of harmful chemicals like mercury causes bio magnification.
Sardines also lack several essential nutrients due to their tight choice of food.