Supermarkets are over-promoting fatty and sugary products using special offers and price reductions, according to a new study.
Professor Paul Dobson, from the University of East Anglia (UEA), has led a three-year study of consumer behaviour towards food and the impact on overeating and food waste.
He concluded that unhealthy foods receive too much promotion from supermarkets, and says the food industry must do more to promote healthy living.
"It is simply irresponsible for supermarkets to overly promote foods with high sugar and fat content," said Prof Dobson.
"The food industry must play a much greater role in promoting healthy diets.
"Food producers can do more by reducing the fat, sugar and salt content of processed foods, while food retailers can ensure that healthy and nutritious choices are available and affordable to all consumers and that they practice responsible marketing."
He said that if retailers and producers did not take responsibility, regulation "might be needed".
Supermarket giants including Tesco and Asda were the focus of the study Special offers are worth more than £50bn in sales to supermarkets and account for over a third of all consumer spending.
The research team analysed weekly price and nutrition data of a full range of food and drinks products sold over a year by four UK supermarkets - Tesco, Asda, Sainsbury's and Ocado.
They found a bias towards sugary products for price promotions and that straight price discounts are on average more skewed towards unhealthy products.
Special offers also tended to be slanted towards more unhealthy products, especially those with high sugar content.
However, multi-buys were on average more biased towards healthier items.
Prof Dobson will outline his findings at a lecture in London later.
"While price promotions can offer savings for consumers they may not be so good for our waistlines and health," he added.
"With almost a quarter of the population classed as obese, overeating and food waste are serious concerns for modern society."
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