Food choices are complex and are influenced by several internal and external factors. As our current food choices have long-term health consequences and the prevalence of obesity and non-communicable diseases is increasing world- wide, knowledge on influencers of dietary choices is necessary. In this thesis, I examine a subset of factors influencing food purchases and dietary quality: information in the form of nutritional food labels, life events in the form of retirement, and finally habit heterogeneity. I use Home Scan data sup- plemented with questionnaires and administrative data to investigate each factor. Several countries have implemented mandatory or voluntary food labels to inform and guide consumers towards healthier food choices. Most recently, Front-of-Pack (FOP) labels have increased in popularity. Paper 1 investigates the effect of using FOP and Back-of-Pack (BOP) nutritional food labels on dietary quality and nutrient consumption. I find that the use of FOP labels results in a small increase in overall dietary quality, while the use of BOP tables does not affect dietary quality. Eating healthy is important for health in the longer term, and as the population share of elderly is rising globally, health at old age has become an increasing concern. Paper 2 and Paper 3 investigate how retirement affects food purchase behaviour and the demand for dietary quality. Heterogeneous responses are examined in paper 2, while the potential dynamic adjustment is explored in paper 3. The findings show larger increases in food expenditures, dietary energy, dietary quality, and purchase efficiency for single households retiring from the labour market. There are indications of dynamic adjust- ment in food expenditures and overall dietary quality, while energy is only statically affected. The reaction to life-changing events or dietary policies depends on the existing habits of the consumer. Paper 4 explores the heterogeneity of habits in food consumption behaviour. We apply a new definition of habitualness and construct a habit index based on this definition. Our results show that consumers are not very habitual according to the definition we apply, but there are signs of heterogeneity across product groups and households. We investigate general price sensitivity and tax responsiveness in the case of a sugary soft drink tax and a fat tax in Denmark and find that habitual con- sumers are generally less responsive to price changes but more responsive to tax increases. The PhD thesis contributes to the extensive literature on food purchases and dietary quality. The findings shed light on a selection of influencing factors and have implications for both policy and future research.