Twice as many (47 per cent) consider roast potatoes as part of their recommended fresh produce intake, the survey found.
It also confirmed government figures showing the public's shortfall in fruit and vegetable consumption, with 70 per cent saying they do not eat five portions a day.
Perhaps surprisingly, nearly twice as many (34 per cent) blamed this shortfall on "not having the time" to source and prepare fresh produce, rather than its cost (18 per cent).
The retailer says it stocks 92 lines in its Basics range that contribute to shoppers' five-a-day recommendation, as well as £1-a-bag British vegetables.
Misunderstandings over five-a-day continue, survey shows
Nearly a quarter of shoppers think chips count as one of their five-a-day portions of fruit and vegetables, according to a survey commissioned by Sainsbury's.
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