Is Kefir Ultra-Processed?
No — plain kefir is NOVA 1, just fermented milk with kefir cultures
No. Plain kefir is NOVA 1 (unprocessed or minimally processed). It is one of the oldest fermented foods in the world — just milk cultured with kefir grains. Products like Lowicz Kefir contain only two ingredients: milk and kefir cultures, with zero UPF markers. However, flavoured kefir is a different story. Yeo Valley Kefir Mango & Passion Fruit scores NOVA 4 because it contains 'flavourings' and 'natural flavourings' — the same pattern we see with yoghurt. If you want to avoid ultra-processed food, stick to plain kefir.
Why Kefir scores NOVA 1 — Unprocessed
Kefir is fermented milk, and fermentation is one of the oldest food preservation techniques known to humanity. The process involves adding kefir grains — a symbiotic culture of bacteria and yeasts — to milk and letting it ferment. This is minimal processing by any definition, which is exactly what NOVA 1 describes.
The Lowicz Kefir Yogurt Drink (400g, £1.00) contains just two ingredients: milk and kefir cultures. Zero UPF markers. The Mlekovita Kefir Yogurt Style Drink (1 Litre, £2.20) is also NOVA 1, though it lists 9 ingredients — the higher count appears to be due to vitamin and mineral fortification declarations rather than industrial additives.
The pattern mirrors yoghurt exactly. Plain kefir is NOVA 1. The moment a manufacturer adds flavourings, the score jumps. Yeo Valley Organic Kefir Mango & Passion Fruit (4x100g) scores NOVA 4 with 2 UPF markers: 'flavourings' and 'natural flavourings'. It also contains 9.7g of sugar per serving. The word 'organic' on the label does not prevent a product from being ultra-processed — it is the ingredient list that matters.
Nutritionally, plain kefir is a good source of protein and calcium, with a diverse range of probiotic cultures — typically more varied than standard yoghurt. The fermentation process partially breaks down lactose, which some people find easier to digest.
Key additives to watch for
Kefir at Tesco — NOVA scores
Source: Tesco product page, March 2025
*Prices were correct at the time of collection and may have since changed. Check Tesco.com for current pricing.
What to look for when shopping
Plain kefir is always NOVA 1 — look for short ingredient lists with just milk and kefir cultures. Flavoured kefir varieties often add 'flavourings' or 'natural flavourings', which pushes them to NOVA 3-4. If the ingredient list mentions anything beyond milk, cream, and live cultures, check carefully. The word 'natural' in 'natural flavourings' does not mean it is unprocessed — under NOVA classification, both 'flavourings' and 'natural flavourings' are UPF markers. Budget tip: Lowicz Kefir at £1.00 for 400g is the cheapest plain kefir at Tesco and is NOVA 1 with just two ingredients.
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