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What Is The One Most Important Thing You Can Do To Keep Your Memory Razor Sharp?

By November 5, 2009March 27th, 20242 Comments

Eat fish.
Simple isn’t it. Yet how may of us are

a) aware of the benefits to our brains of including fish regularly in our diet and

b) how many of us actually put it into practice even though we know it’s good for us?

So what is it about fish that is so good for the brain?

Fish Oil, lovely fish oil, full of Omega-3.

And it’s not just a case of any old fish. The recommended fish to have are the fish that are carnivorous ie they eat other fish, that don’t live too long (because they can accumulate too much mercury which is toxic!) and they tend to be cold water fish.

So, having ascertained that, it’s simple. Just pop down to your nearest fish market or supermarket and ask for the best carnivorous, short lived, cold water fish bursting with Omega-3 they have fresh today.

The fish that are particularly recommended include:

Salmon, Sardines, Herring, Tuna. Mackerel and Anchovies.

So what are these Omega-3s? Well, they are polyunsaturated fatty acids and they are essential as an essential component for all cell membranes for the whole body. The key fatty acid for our brain is DHA (or Docosahexaenoic acid for short).

The body can produce its own DHA but not in adequate quantities, hence we need to include it in our diet.

The structure of the cell membrane around each cell determines what can pass in or out of the cell. If we lack sufficient Omega-3 building blocks to maintain the normal structure and integrity of the cell membrane then the cell concerned may not function as well. If this is a brain cell then obviously our brain will not be functioning to its best level.

As we get older our ability to produce our own DHA also declines, again making supplementation through our diet increasingly important.

Can’t stand fish? Well, we can also derive ALA (alphalinoleic acid) another source of Omega-3s from plant sources including kiwifruit, walnuts, avocado, tofu and flaxseed.

Having sufficient Omega-3 will keep our brain and eyes  healthy, help in stabilising mood, and lower our risk of developing depression and dementia.

Omega-3 assists our ability

to learn

to focus

to problem solve

to remember

to improve communication between brain cells and

to protect us from oxidative damage.

Pass the tin of tuna now please.

And yes, there is more in terms of benefits for our general health. Not only are the Omega-3s good for our brains, they help our blood fats by reducing our triglyceride levels, improve the elasticity of our blood vessels and help to lower blood pressure. They help to keep the blood thin and prevent clots and have been demonstrated to be important in maintaining a normal heart rhythm.

Convinced yet?

So how much do we need?

Two to three meals of fish per week is the current recommendation.

This can be fish that is tinned or fresh, baked or grilled or prepared in any way you like.

I was brought up on “fish fingers” as a child, which can be a great way to introduce kids to fish if they are not keen on fish on it’s own.

And we always had fish on Fridays.

Fish and chips as a take away meal will add another serve each week. Many of the better “chippies” now offer grilled fish as an alternative to the deep fried, battered and crumbed varieties plus side salads as an alternative to the greasy hot chips. Though being rather partial to the occasional “hot chip” I can rationalise having them knowing the rest of the meal is good for me.

Tinned tuna, salmon and sardines are an easy way to include a serving in a roll or sandwich for lunch.

How much Omega-3 is in a regular serving of fish?

Canned sardines 2000mg per 100g
Atlantic salmon 1000-2000mg per 100g
Swordfish >1000mg per 100g
Whitebait 700mg per 100g
Canned tuna >600mg per 100g
Mackerel 400mg per 100g
Mullet 400mg per 100g
Sardine 300mg per 100g
Tuna 300mg per 100g
Snapper 220mg per 100g
Whiting 100mg per 100g
Barramundi 100mg per 100g

Mussels 400mg per 100g
Oyster 350mg per 100g
Squid/octopus 300mg per 100g
Prawns 150mg per 100g
Lobster/Crayfish 100mg per 100g

(Source: Associate Professor Peter McLennan, Smart Food Centre and Graduate School of Medicine, University of Wollongong)

And the fish skin apparently contains three times the amount of Omega -3 of the flesh.

Eating the fish skin may be good for you, but I have to admit I’m not so keen! It has to be really crispy to entice me to eat it.

The other thing that can be done of course is to take fish oil capsules taking two 1000mg capsules per day.

And for those of you put off by “fish burp” from some capsules, keeping them cold in the fridge seems to help and there are some “burp free” varieties on the market.

Some clever marketers have also manufactured fish oil capsules for kids (enticing them with the thought that these will make them smarter and perform better at school) by making the capsules in the shape of little fish. Great idea if it will persuade the kids to take them, especially if they are fish haters and refuse to eat fish in their diet.

So what is the one thing we can do to keep our memory razor sharp?

Eat fish, preferably three times a week.


Dr Jenny Brockis

Dr Jenny Brockis is a medical practitioner and internationally board-certified lifestyle medicine physician, workplace health and wellbeing consultant, podcaster, keynote speaker and best-selling author. Her new book 'Thriving Mind: How to Cultivate a Good Life' (Wiley) is available online and at all good bookstores.


  • After 19 years as a vegetarian I have started eating fish again for protein and iron. It is not easy to get into the habit of thinking as fish as an option and I often forget that I now est fish.
    I have also started taking fish oil capsules and I am not sure whether my brain has got any shraper but after more than two months I do notice that my skin is less dry – not sure if it is related.
    I try to only eat salmon and fish that are low on the foodchain fish like sardines – they apparently have less mercury and place less impact on the natural fish supplies.
    It is good to read that eating fish will also help my brain power, my memory, my ability to problem solve and also to focus – focus is my weakness – so I am looking forward to further improvement.
    WHat do you think about the mercury content in fish? Have you seen the movie ‘The Cove’?

    • solutions says:

      It’s never to late to implement those changes and to incorporate new foods including fish into your diet. I hope you enjoy it. I’d be interested to hear how it goes for you and whether you notice any difference in your thinking and memory in a few months time

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