It's bad for the many people who have MTHFR mutations (also causes neural tube defects) who can't convert folic acid to folate. With more genetic testing they're finding a higher prevalence of people with those mutations. Hopefully organic flours will remain without it!
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Hopefully they'll identify people more consistently who have that problem so that they can avoid the bread made with the flour and also will clearly label the finished baked goods. As I understand it, depending on the particular MTHFR mutation, the result can be anything from the person simply can't process the folic acid very efficiently up to them having severe issues with homocystinuria. The UK has the highest rate of neural tube defects in Europe, so it's a reasonable action for them to take to help mitigate the malnutrition that causes that problem. (Since they don't seem too keen on making sure everyone has a decent amount of quality food. Bread is cheap.)
I don't think the "dose" per loaf will be particularly high - I think the effort is being made to add it
back to wheat flour that has had it removed by processing out the wheat germ - but since it's also in the following foods if someone has issues with it they need to be cautious to not get too much: spinach, kale, Brussels sprouts, cabbage, broccoli; beans and legumes (e.g. peas, blackeye beans); yeast and beef extracts; oranges and orange juice; wheat bran and other whole grain foods; poultry, pork, shellfish and liver; fortified foods (e.g. breakfast cereals).