We start with a hypothesis, work out measurement criteria, and rigorously test.
If the hypothesis is supported by evidence we accept it – until such time as something better comes along. If the hypothesis is not supported by evidence we reject it – and hopefully something better comes along.
As someone who tries to base decisions on these tenets – I feel it’s time to give you an update on my position on “the Paleo diet”.
Those of you who know me know that I’ve been a proponent of the Paleo diet for a few years now. The reason for choosing it was at the time it seemed to have a sound internal logic to it that elegantly encapsulated what is now starting to be referred to as “evolutionary medicine.”
A fundamental principle being the Dobzhansky quote “Nothing in biology makes sense except in light of evolution.” Paleo espouses:
“eat what your ancestors ate because that’s what you have adapted to eating.” The ‘trouble’ is there is no one “Paleo” diet. Depending on your latitude you may be eating a huge variety of food, and to suggest there is only one way is misguided.
I would describe humans as opportunistic omnivores.
There is no such thing as a toxic substance – only a toxic dose.
Rather than thinking about food in binary terms: as ‘good’ or ‘bad’, perhaps a more useful way would be so visualise a scale or continuum. I would grade the scale based on nutrient density per kilojoule (this is the volume of vitamins and minerals relative to the energy load.) “Real food” tends to be at one end, some processed foods appear in the middle, and what everyone would agree is ‘junk’ appears at the bad end. Then the trick is eating the ‘good’ stuff, having some ‘middle’ stuff, avoiding the ‘bad’ stuff – and not eating too much of any of it.
The common theme that’s running through the “optimal diet” is eating real food.
Unlike processed foods there tends to be high nutrient density relative to kilojoules contained.
The links above point to nutritiondata.com. Here you can find nutritional breakdowns of a huge variety of food, including macro and micro nutrient ratios (vitamins and minerals), protein profiles, inflammation factor, glycaemic indices, fullness factor and other information.