Manufacturers should offer fatty food and soft drinks in smaller portions to help consumers choose a healthier diet.
And consumers should also be given a greater choice of sizes in chocolate confectionery and soft drinks, a watchdog has said.
They called on manufacturers to reduce saturated fat in biscuits, cakes, buns and chocolate confectionery and sugar in soft drinks.
Britain's Food Standards Agency (FSA) said reformulating and reducing portion size would deliver "real public health benefits".
The agency has asked industry to prioritise reductions in their biggest selling products.
The recommendations include reducing saturated fat in some chocolate bars with fillings by at least 10pc, in plain sweet and savoury biscuits and plain cakes by at least 10pc and in other biscuits and cakes by 5pc.
Soft drinks containing added sugar should be made readily available in single portion sizes of 250ml, down from the current standard smallest size of 330ml.
Further recommendations will follow early in the summer on dairy and meat products, pastry and savoury snacks.
The FSA said it did not want the 330ml size replaced but wanted consumers to have a greater choice. It also said manufacturers should price smaller sizes accordingly.
"Food businesses regularly review ingredients and processes, as well as portion sizes," said a spokesman.
"The aim of these recommendations is to encourage them to consider how they can play their part in improving public health by reducing saturated fat intakes, which are a factor in heart disease, and helping consumers to maintain a healthy weight."