Are red greens greener than green greens?

Yesterday, my mum messaged me to ask a question that had just occurred to her:

“Are red greens healthier than green greens?”

She’d just bought a red cabbage instead of green to go with her dinner and was wondering if there was any nutritional difference between them or whether it was all about the colours. As someone who knows a little bit about plants, I was her first port of call but, as someone who has absolutely no expertise in nutrition, I also knew I was out of my depth…

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