Eggs and fish are great foods to include in your familie's diet as they can help improve concentration, but they’ve got to be the right kind:
Oily, fatty fish such as herring, wild or organic salmon, mackerel and trout contain the essential omega-3 fats that are proven to sharpen your mind. In fact, blood levels of omega-3s in newborn infants correlate with their IQ at the age of five.

If you don’t like eating fish, supplement an omega-3-rich fish oil every day, for you and your children.

Eggs contain phospholipids that also help improve memory and concentration. Don’t fry them, as this destroys the valuable nutrients, and always go for organic or free range.

It’s a complete myth that eggs raise your blood cholesterol. True, eggs do contain cholesterol, but they are also an excellent source of protein, vitamins, minerals and more importantly unsaturated fats, especially if you feed the chicken good seeds. Of the 5g of fat in an egg, half is monounsaturated (as in olive oil), which actually helps lower the risk of heart disease.
Please STOP asking for egg white Omelette thinking that it is better for you! You need to remember that it is in fact fried so it will contain all the bad fats, and you will be missing out on the most important part of the egg which is the yolk.
The egg yolk contains one of the richest known sources of choline, the newest official member of the B vitamin family. Choline helps keep your cell membranes (the doors through which nutrients enter and wastes leave your cells) functioning properly, it prevents the build-up of Homocysteine in your blood (Homocysteine is a harmful compound that is associated with cardiovascular disease and osteoporosis), reduces chronic inflammation and helps the body make good use of fats including cholesterol.
The trouble is, if you fry them you destroy these beneficial nutrients and damage these good fats. Also, an egg is only as healthy as the chicken that laid it, so if possible buy nothing but organic, free-range eggs from chickens that have been fed grains and seeds, rather than battery chickens fed an unknown concoction of things.
My advice if you have raised cholesterol is to have no more than 5 healthy eggs a week, make sure they come from a healthy source and don’t fry them... I would recommend for everyone to enjoy their eggs poached or boiled as they will be full of wonderful nutrients...