Professional trainer and weight loss nutritionist here. Some free information:
Conventional wisdom on health is something that starts new every 3 generations and is pretty much always wrong.
Modern day perceptions are also wrong, as will be the future one because they don't/wont factor in oxalates, glutamine, insulin spikes, naturally occurring sugars etc
In a general sense, fat gains are largely the result of insulin spikes. The spikes force the liver to create fat cells rather than regular metabolization and also creates insulin resistance (moves you towards diabetes).
In effect, carbohydrates, starches, most dairy and most fruits are bad for you because their inherent nature creates this situation and your body doesn't perceive it as anything different to sugar (just in smaller amounts)
Its also worth mentioning that sugar and glutamine are often the sole food supplies of cancer cells, so diets high in carbs, sugars (processed or natural) create the optimal environment for weak new cancer cells to grow and replicate, which would often otherwise be destroyed by your immune system.
In a nutshell.
Don't eat more than 50g of net carbs per day (carb in grams minus fiber per gram)
Only eat a handful of berries and an avocado a day as most for fruit intake
Avoid starches
Eat green peppers and drink green tea to inhibit glutamine metabolization.
I'm not giving any more information for free (ha!) but thats the skinny on letting you know why the next set food pyramid from the government is also going to be wrong.
Oh and also they get paid to push this by big corporations who sell that crap. lets not ignore the obvious..
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