The vast majority of adults have no idea how much saturated fat they should eat every day, a poll suggests.
Eighty four per cent of adults do not know that men should eat no more than 30g of saturated fat each day and women should eat no more than 20g, the survey found.
The poll, conducted by supermarket Sainsbury's, also found that one in five adults think that all types of fat are bad for one's health.
More than half of half of people said they would follow dinner with Christmas pudding, with 23 per cent planning to have dollop of cream. Between meals, 40 per cent said they snacked on nuts and 30 per cent on crisps, both of which are often contain added salt.
A third of people will eat at least one mince pie, and over half enjoy chocolates throughout the day. Combined with overindulgence at mealtimes, sweet snacks bring the average person's Christmas day sugar intake to the equivalent of 32 teaspoons.
A full English breakfast will be eaten by more than one in 10 on Christmas morning, while 14 per cent will instead choose a bacon sandwich.
The average fried breakfast contains around 1,200 calories, and a bacon sandwich with brown sauce can contain more than half an adult's recommended daily salt allowance.
Almost three quarters of those surveyed said they eat a traditional turkey dinner on 25 December. The typical Christmas meal, including trimmings, adds up to 660 calories.
The British Heart foundation has warned that the average person in Britain could consume the equivalent of half a pack of lard in saturated fat, and as much salt as would be found in 50 packets of crisps on Christmas Day.
In a survey, the charity asked 2,000 people who celebrate Christmas what they eat and drink over the festive period. For many people, the Christmas indulgence starts before the turkey is even in the oven, it found.