When you're at the supermarket, do you wonder how much much tuna you're getting in a can?

Brisbane/Meanjin-based dietitian Josh Wernham shared a series of popular videos on social media comparing how much food there is in some packaged goods.

He found variants such as tins of tuna where one tin contained 35 per cent tuna (supermarket brand with flavoured oils) while another was 73.5 per cent tuna (brand name in spring water). The price and amount of protein also differed between products.

"As a dietitian, I've seen first-hand how confusing food labels can be for people," Mr Wernham says.

"And even when recommending certain products to clients, I am aware that I need to be quite specific at times due to the variation."

Why products vary

A recent review conducted by consumer advocacy g

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