A good and balanced diet is central to overall healthy living. However, diet-related diseases have increased in the last decades and became a major public health concern in most developed countries. Consumers’ information and responsiveness are therefore crucial when they purchase goods. On the occasion of the consumers’ rights week, Prof. Rachel Griffith, an ERC Advanced grantee 2009 based at the Institute of Fiscal Studies (UK), explains her research about consumer food purchasing behaviour, firm food pricing behaviour and their impact on nutrition.