Is there enough scientific evidence supporting the 2015 Dietary Guidelines for Americans? Not according to this article:
ResearchGate: Problems with the 2015 Dietary Guidelines for Americans
For example there’s no sound evidence for allowing about half of all grains to be refined (!) or for the truly old and moldy recommendation to eat low-fat dairy and to avoid natural saturated fats.
There’s even is a great risk that these guidelines lead to higher risk of diseases such as cardiovascular disease, cancer, obesity, diabetes etc.
This means that you’re likely better off going against the recommendations by consuming natural foods such as meat, fish, eggs, natural fats and vegetables, rather than foods low in saturated fats and sodium, but full of grains and industrial oils.