"Eat more fresh and less processed food" doesn't seem to be dreadful advice. Certainly not harmful.
As food goes through more stages of processing, we tend to have (proportionally by weight) more calories and less nutrition (fibre, vitamins and minerals). From wholegrains to wholegrain flour to white flour to doughnuts quite a bit is lost. Which does not mean nobody should ever eat doughnuts, but it does mean that someone who lives their lives more on the processed than the fresh side is probably going to consume more calories and have less vitamins and minerals.
Which happens to be what we see in the West. The result is people living quite long lives, but ones in which they do not always enjoy good health, and are often on fad diets and popping lots of vitamin and mineral pills.
We can endlessly study the scientific details of it, but what it comes down to is four basic guidelines,
- stop smoking
- eat less junk food; "junk" is generally speaking any food where the packet is more colourful than the contents
- drink less booze
- eat more fresh fruit and vegies
Almost everyone who follows these guidelines finds that they fairly quickly look, feel and perform better. If you doubt this, consider what would be likely to happen if you started smoking (or smoked more), ate more junk food, drank more booze and ate less fresh fruit and vegies - would you expect to look, feel and perform better as a result?
This is the 20% of nutritional effort which gives you 80% of your results, for most people. The other 80% of stuff giving 20% of results is stuff we can seriously argue over. We make this stuff more complicated than we have to for practical purposes. It's like when someone who has never squatted agonises over the low bar vs the high bar vs the front squat - just start fucking squatting.
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