Low-income groups face particular difficulties that make it more likely that individuals will become overweight and need obesity treatment, experts have said.
A spokeswoman for the British Nutrition Foundation (BNF) pointed out that the recent Low Income Diet and Nutrition Survey (LIDNS) had raised a number of key issues.
Lisa Miles revealed: "Intake of fruit and vegetables is half of the recommended five portions per day.
"Intakes of added sugars (particularly among children) and saturated fats are above UK recommendations. Intakes of fibre are below the UK recommendations and many men and women are overweight or obese."
The expert said that people on a low income can save money by buying loose fruit and vegetables from markets, teaming up with friends to share fresh food, and purchasing frozen fruit and vegetables which are "just as good and are often cheaper".
In addition, Ms Miles suggested that students are particularly at risk of unhealthy eating, noting: "University can be a time of life where unhealthy habits start, as it is often the first time that young adults are entirely responsible for their own diet."
Independent advice on private healthcare