Due to the COVID-19 coronavirus pandemic, the reality of life, work and relationships of the Spanish population has suddenly changed. The aim of this study was to determine the impact of the period of confinement on the behaviour of the population. The participants were people of Spanish nationality who did not have chronic or mental illnesses that could affect their diet or emotional state. The sample consisted of 519 people, from all over Spain, 351 participants were women and 168 men. Most of the sample was made up of subjects between 18 and 30 years old. We proposed an observational, descriptive, cross-sectional study using surveys. An ad hoc questionnaire was designed to explore a series of variables: eating habits, social relationships and some emotional aspects. The questionnaire was distributed for eight weeks using non-probabilistic snowball sampling. In general, eating behaviours were improved in the period of confinement. The population consumed more home-made food prepared by themselves. Women suffered more emotional and psychological burdens during confinement than men. Younger people suffered more intense emotional issues during confinement. The period of confinement did not significantly affect the physical condition of the population. The most negative impact was recorded on psychological and social variables, as well as on work and studies.

Eating together as a family has important health benefits, as the diet is more balanced and of a higher quality. Eating together is also a factor in the prevention of diet-related diseases. The promotion of family and shared meals is currently a public health strategy. The aim of this research was to study the eating habits of the Spanish young adult population and their impact on health. An observational, descriptive, cross-sectional study was carried out using surveys. A questionnaire was designed and validated to explore a set of variables related to food and health. The dissemination was carried out through social networks by means of an online form, using non-probabilistic snowball sampling to obtain a sample of 17,969 subjects aged between 18 and 45 years. We found statistically significant differences between people living in a family home compared to people living outside a family home in the healthy eating index for the Spanish population, fish consumption, and fried food consumption. This suggests that the nutrition of people living in a family home is healthier, although their BMI is higher. People living together have a statistically higher healthy eating index value than people living alone; consume fast food, fried food, and ultra-processed food less frequently; and eat fish more often. On the other hand, people who live in a family home or are accompanied are more likely to have a sedentary lifestyle and are less physically active. It was concluded that people living alone have a worse healthy eating index than those living with company, which seems to indicate that nutritional interventions should pay attention to people living alone as a variable to be taken into account in future analyses.