From http://www.fao.org/3/a-i1953e.pdf one of the three reports the WHO cited on that recommendations page:[quote]There was convincing evidence that energy balance is critical to maintaining
healthy body weight and ensuring optimal nutrient intakes, regardless of macronutrient
distribution of energy as % total fat and % total carbohydrates.
Full agreement among the experts regarding the upper value of acceptable
macronutrient distribution range (AMDR) for %E fat was not achieved; thus
maintaining the current recommendation for a maximum intake value of 30-35%E
fat was considered prudent.[/quote]
You can read the full report from the link, their findings were that saturated and trans fatty acids (SFA and TFA) were positively associated with CHD risk and possibly diabetes while poly and mono weren’t. That info comes from the conclusions sections.
They couldn’t come to agreement on an acceptable maximum, so stuck to the old recommendation. I believe an acceptable maximum will only come from determining the acceptable minimums of protein and carbs, and that a broad range of acceptable macro ratios will be the result, not a specific recommended ratio.
edit: furthermore, codemaker’s link to the Soylent FAQ contains the quote you’re looking for from the IOM.