Internet searching just throws up people arguing about it 
Is the (agreeable) difference that processed food is completely recognisable raw ingredients turned into something
- like fruit turned into jam/yeast into marmite
And ULTRA processed food is occasional ingredients with a longer list of additives - stabilisers/gum/E numbers/ ?
Basically I want to be able to compile my own list of food to avoid - and find replacements for things I eat every day (crisps that aren't crisps like Quavers and Wotsits)
And is Ryvita a processed food - basically baked wheat ? But not ultra processed? - I eat them every day !