The use of blood sugar monitors in people without diabetes is not supported by research and may cause anxiety, experts have warned. The monitors are being widely advertised as a way of personalising diets and are being marketed by several firms, including as part of Professor Tim Spector’s Zoe programme. Zoe says on its website that blood sugar spikes can, over time, lead to an increased risk of heart disease. Its programme assesses a person’s blood sugar responses to food and also looks at blood fat levels and gut bacteria. “From this information, we can provide personalised nutrition advice …