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Prebiotics are hard to stomach, but will your gut thank you for trying? | Zoe Williams


You’ll have heard of probiotics, because they’re very 2015, which I have identified as the year in which everyone started talking about gut health (the phrase “gut fauna” entered the vernacular a bit later). The potted version is that you want your gut bacteria to be as varied and exciting as possible, and the best way to ensure that is by eating fermented foods: yoghurts, kefir, kombucha, sauerkraut. Cultures that are alive when you consume them.

Prebiotics are different: these are sources of indigestible fibre. Roughage, broadly, is the element of a plant or legume that won’t dissolve in water, and therefore moves intact through your body, not releasing calories but doing other useful things, such as keeping you regular. There’s a sub-category within that, though, of indigestible fibres that the bacteria inside your gut can digest: almost always raw, and very often weird – dandelions, acacia gum – and this will boost your bacterial environment overall.

If it helps, think of your gut more as a city than an organ, full of living creatures who need interesting feasts in order to thrive. So you boost your probiotics to increase bacterial variety in the first place – and then you bring in prebiotics to feed them. The probiotic guru is Tim Spector, now better known for his Covid tracker, who explains the gut brilliantly in his book Spoon Fed.

Since you’re seeking the indigestible, whatever it is usually has to be raw, unless it’s an onion. So first, I got a mandolin. You can eat anything raw if it’s sliced thinly enough; if I had more slicing time, I’d be able to get rid of my oven. Raw asparagus is an acquired taste – initially, it tastes like an accident. Eventually, it tastes like itself, only fresher. Finally, underripe bananas are a surprise source of prebiotics, and really easy to eat more of. I saw all of this as extra to, rather than replacing my previous diet; I never stopped eating cooked vegetables. If you look at it as a process of inclusion rather than exclusion, it’s much easier to do long term.

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The big unknowable is whether it’s making any difference: this is because a healthy gut environment has an impact on so many things – sleep, mood, inflammation and everything that ripples out from those fundamental pillars of health – that it’s hard to put your finger on what you’d actually measure. You have to take a completely gestalt view: “Am I feeling absolutely incredible from every angle?” And if the answer is, “not exactly”, it might not necessarily be insufficient leeks. It might be too much of something else, such as beer.

After a month, I did feel more energetic; but I should disclose that this coincided with the kids going back to school. I’d say the main benefit is that you skew your attitude in a good direction. Once you anthropomorphise your bacteria, you end up treating your gut with a little more respect: less like the bog-standard apparatus you were born with, and more like a Tamagotchi, something to tend.

What I learned

One meta study identified 25 separate conditions improved by prebiotics, from allergies to immune function, IBS to bone health.



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