Trendy fermented foods can make you ill, say top scientists, as they reveal the top offenders for causing allergies, rashes, tummy troubles and potentially fatal infections

Fermented foods have never been so fashionable. Demand for kimchi, kefir and sauerkraut has soared in recent years, thanks to their reportedly beneficial impact on gut health. Fermented foods have never been so fashionable. Demand for kimchi, kefir and sauerkraut has soared in recent years, thanks to their reportedly beneficial impact on gut health.