I don't imagine it's possible to turn back to such a diet, given what we have done to our planet, over-population and consumerism.

If that is the case, all that is left is genetic improvement to fit our new lifestyle which has the added benefit of maybe giving our scientists the ability to adapt us to other effects of living here such as pollution and disease.

Anthony, Manchester, UK

The main problem isn't genes but the excessive consumption of substances for which we are not designed, particularly the immunosuppressing vegetable oils (ie. sunflower oil), and perhaps also too much carbohydrate and sugar. Cancers are supposed to be mopped up by the immune system: if it is compromised then problems follow.

We should be concentrating on that which affects the immune system before we turn to genes (and the non-solutions they offer).

I reckon this particularly means questioning the industrial diet of artificial fats (ie. marge), carbs and sugar (inc. fruit) that is 90 degrees away from a farmer diet, and 180 degrees away from our original hunter gatherer diet (whose fruit was not laden with sugar prior to the farmer's manipulations).

Greg Lorriman, Leatherhead, UK