This is a hard question.
I think that the first step should not be to promote RAF, but just to discourage junk-food and fast-food consumption, and encourage people to prepare their meals at home, even if cooked. Rome wasn't built in a day...
I think that education programs/campaigns/efforts are not very effective. There already exists an education campaign encouraging people to "eat 5-10 fruits and vegetables a day", and limit junk food. People know that junk food is bad for them, but they are literally addicted to it and can't stop eating it.
Some practical solutions:
Stop subsidizing corn and grain, start taxing junk food just like cigarettes, put big warning labels on junk food. A few years ago I went on a trip to England. I saw that all cigarette packages had huge black-and-white warning labels "smoking kills". In Canada, the warning is in barely readable fine print. Such warning labels should be adopted everywhere, both for cigarettes, and for junk food. That would be a small step in the right direction.
Ultimately, the problem is, that in a democratic society, freedom of choice goes both ways. If we want the freedom of choice to buy raw milk, and raw grass-fed meat and wild game, then we must also allow the freedom of choice to buy McDonalds and Coca Cola and other junk.
One radical solution, would be for a health-conscious dictator to outlaw junk food by brute force. Impose insane taxes on, or outlaw the production of, corn syrup, refined sugar, soybean oil, etc. But the problem is, that a dictator cannot rise to power unless he has support. But who will support such a dictator? Health-conscious people are a very small minority. In history, dictators have risen to power by promising people happiness, and solutions to problems. One can promise that healthy food will lead to healthy and happy and successful people, but I don't think that the masses of junk-food-addicts would support such a message.