Two debt advice charities have asked Countdown presenter Carol Vorderman to stop promoting consolidated loans.
Vorderman appears in TV adverts by Barclays-owned FirstPlus, which encourages people with multiple debts to pay them off with another loan, which is secured against their house and puts it at risk of repossession.
Malcolm Hurlston, chairman of the Consumer Credit Counselling Service, and Keith Tondeur, national director of financial education charity Credit Action, have both urged Vorderman to stop doing the adverts.
Tondeur said: "By using a personality renowned for mathematical ability, these adverts suggest secured loans offer a solution for people with debt problems."
The protest includes a petition on finance site moneysavingexpert.com.
More concerns about secured loans were raised in the BBC TV programme Real Story last week.
Vorderman has yet to comment on the issue.
- See Opinion, page 24.