Moving Out Linked to Poorer Diet in Young Adults: Australian Study

Leaving the parental home, a rite of passage for young adults, may also signal a shift toward less healthy eating habits. A new Australian study reveals that young people tend to experience a decline in diet quality after moving out, with a notable increase in discretionary food consumption. Although the link isn’t necessarily causal, the findings underscore the importance of supporting healthy eating as young adults navigate this significant life transition.

Diet Quality Trajectories in Adolescence and Early Adulthood

Good nutrition during adolescence and early adulthood is crucial for establishing lifelong healthy habits. Research consistently links poorer diet quality to a range of health risks, including increased risk of obesity, higher body mass index, and cardiometabolic issues that can persist into adulthood. The study, published in Health & Place, sought to understand how leaving the parental home influences these dietary patterns.

How the Study Was Conducted

Researchers from the Raine Study in Australia followed 1,135 participants aged 14 to 27 years over several years. Participants completed food frequency questionnaires at ages 14, 17, 20, 22, and 27, allowing researchers to track changes in their dietary intake over time. Diet quality was assessed using two key measures: the Dietary Approaches to Stop Hypertension (DASH) diet score – a measure of how closely a diet aligns with recommendations for heart health – and the proportion of energy derived from discretionary foods and beverages (those not considered part of core food groups). Living arrangements – whether participants lived with parents, a partner, friends, or alone – were also recorded.

The study design leveraged existing longitudinal data from the Raine Study, a long-term cohort study that began recruiting pregnant women in Western Australia in the late 1980s. This allowed researchers to observe changes in diet quality as participants transitioned from adolescence into early adulthood and moved out of their parental homes. Researchers used multilevel regression models to analyze the data, accounting for the repeated measurements taken on each participant over time.

Key Findings: A Dip in Diet Quality

The study revealed a U-shaped trajectory in DASH diet scores, with the lowest scores observed around age 20. Importantly, leaving the parental home was associated with a decline in diet quality, reflected in a decrease of approximately one point on the DASH score. Alongside this, discretionary food intake increased by about 1% after young people moved out.

The largest drop in diet quality was observed among those who moved in with a partner. While those living with friends or alone also experienced lower DASH scores, the effect was less pronounced. Interestingly, the initial decline in DASH diet score associated with leaving home appeared to persist over time, while the increase in discretionary food intake tended to diminish.

What Does This Mean for Young Adults?

These findings suggest that the transition to independent living can be a vulnerable period for dietary habits. Several factors may contribute to this. Moving out often involves increased financial independence, which can lead to greater consumption of convenient, processed foods. Changes in cooking skills, time constraints, and social influences can also play a role. Living with a partner, in particular, may introduce new dietary patterns and shared food preferences that differ from those established in the parental home.

It’s important to note that this study demonstrates an association, not causation. While the researchers observed a link between leaving home and changes in diet quality, they cannot definitively conclude that moving out *caused* these changes. Other factors, such as changes in employment, education, or social life, may also contribute. Another study, a latent growth analysis published as a preprint, also found changes in diet quality associated with life transitions, including leaving the parental home, reinforcing the idea that this is a critical period for dietary habits.

Beyond Australia: Broader Implications

While this study was conducted in Australia, the findings are likely relevant to young adults in other countries as well. The transition to independent living is a common experience across cultures, and the challenges of maintaining a healthy diet in this context are likely universal. The authors point out that adolescence and early adulthood are understudied life stages, and more research is needed to fully understand the factors that influence dietary behaviors during this time.

Understanding the DASH Diet

The DASH diet emphasizes fruits, vegetables, whole grains, lean protein, and low-fat dairy products. It limits saturated and total fat, cholesterol, and sodium. It’s not a weight-loss diet, but studies have shown it can assist lower blood pressure and improve heart health. A higher DASH score indicates a diet more closely aligned with these recommendations.

What Comes Next: Supporting Healthy Transitions

Further research is needed to explore the specific factors that contribute to dietary changes after leaving home. This could include investigating the role of cooking skills, food literacy, financial resources, and social support. Interventions aimed at promoting healthy eating during this transition period could be beneficial. These might include cooking classes, nutrition education programs, and initiatives to increase access to affordable, healthy foods. Public health efforts should also focus on raising awareness about the importance of maintaining a healthy diet as young adults establish their independence.