Fans of curry have been warned that more than a whole day's worth of saturated fat can be hidden in a single Indian takeaway meal.
An average portion was found to contain a whopping 23.2g of saturated fat - the type that raises the risk of heart disease if eaten in excess.
Nutritionists recommend that women eat no more than 20g of saturated fat in one day, while men may eat up to 30g.
Researchers from consumer organisation Which? also tested Chinese and pizza takeaways for their fat, sugar and calorie content.
Compared to the Indian food, the Chinese takeaways had a lower saturated fat content but contained nearly three times as much sugar - in one portion there was more than 19 teaspoons.
Takeaways are not legally required to tell customers the nutritional breakdown of their food, so they may not know if there are low-calorie or low-salt options available.
For example, Indian takeaway fans may be surprised to discover that naan bread contains more calories, weight for weight, than chicken tikka masala, according to the meals Which? tested.
Some pizza chains, including Pizza Hut and Domino's, voluntarily give nutritional information on their websites.
But in one case the details differed substantially to Which?'s results with the four Domino's cheese and tomato pizzas tested having at least 50% more fat per 100g than the website stated.
Which? editor Neil Fowler said: "We don't want to be killjoys when it comes to takeaways, everyone's entitled to enjoy a treat while they're watching the footy or a movie, but we would like people to be aware of just how much of their daily food intake comes in just one meal.
"A day's worth of fat or sugar shouldn't be ignored!
"Unlike at the supermarket, it's almost impossible to work out the nutritional content of a takeaway.
"Highlighting healthier options is useful, but ultimately we want consumers to have much clearer information about fat, sugar and salt levels."
