It is the same old 'healthy wholegrains' but also much greater share of lentils etc and these don't turn to glucose as quckly. I am sure a large proportion of the population might be a lot healthier for eating a wide variety of proteins as this suggests but a very insuliin resistant person might find the carbs too much.
I think the flexitarian approach is desigined for those who gave Veganuary a bash but by 17th January are about ready to eat a cow and need an officially sanctioned way out!
Beans, chickpeas, lentils and other legumes - 75g a day
Fish - 28g a day
Eggs - 13g a day (so one and a bit a week)
Meat - 14g a day of red meat and 29g a day of chicken
Carbs - whole grains like bread and rice 232g a day and 50g a day of starchy vegetables
Dairy - 250g - the equivalent of one glass of milk
Vegetables
There will be people who can't eat nuts, others will not be able to eat fish and there will also those who can't tolerate dairy products. I even know some who can't eat meat or chicken (my BIL, not a choice thing, just can't. I assume he's not unique). Me? I just can't eat whole grains like bread and rice, starchy vegetables or pasta.
Fairly good selection . . . . if you can eat all the stuff.