Why is salt and sugar so addictive? Together, they make food taste more intense and more rewarding, so it's easy to keep eating long after you're full. Whether food can be truly "addictive" is still debated, but researchers call foods like this "hyper-palatable", and studies suggest they can lead us to eat more without noticing.
If you've ever opened a bag of salted caramel popcorn "just for a handful", you'll know exactly what we mean.
The quick version
- Salt and sugar together make food taste better, so it's easy to eat too much.
- Scientists call these foods "hyper-palatable". They're everywhere.
- In one study, people ate about 500 extra calories a day on ultra-processed food.
- Aim for no more than 6g of salt and 30g of free sugars a day (NHS).
The Science Behind the Cravings
At the heart of our obsession with the salt-sugar combo is a little bit of food science and a lot of human biology. Our brains are wired to seek out foods that provide both glucose, an essential fuel, and minerals like sodium, which are vital for body functions. When these two are combined, they trigger a pleasure response in the brain. This response is so powerful, it can often feel addictive.
Researchers at the University of Kansas analysed thousands of foods and found three combinations that make food "hyper-palatable": fat and salt, fat and sugar, and carbohydrates and salt. By their definition, 62% of foods in a major US food database met the criteria (Fazzino, Rohde and Sullivan, 2019).
In a tightly controlled US study, 20 adults ate either an ultra-processed or an unprocessed diet for two weeks each, and could eat as much as they liked. On the ultra-processed diet, they ate around 500 more calories a day and gained about 0.9kg (Hall et al., 2019).
The Taste Sensation
When salt and sugar hit your taste buds, they do a delightful dance. Salt enhances sweetness, making sugar-tasting flavours pop even more. Meanwhile, sugar can tone down the bite of salt, smoothing out its sharp edges to create a more rounded flavour profile. This balance is not just pleasing; it hooks your taste buds and keeps you coming back for more.
Examples from Everyday Foods
Think about the foods that you find most addictive, chances are, many of them will leverage this dynamic duo:
- Caramel popcorn: salty butter meets sweet caramel.
- Barbecue sauce: molasses and salt in one tangy sauce.
- Chocolate-covered pretzels: the classic sweet-salty combo.
Cooking Tips: Using Salt and Sugar in Your Kitchen
Salt and sugar are useful in the kitchen, as long as you use them with a light hand. A few tips:
- Meat rubs: a little sugar balances the salt and helps it caramelise.
- Sauces and soups: a pinch of salt cuts bitterness, and a little sugar softens a salty broth.
- Baking: a pinch of salt makes sweet flavours stand out.
Mindful Eating
While the allure of salt and sugar can make meals more enjoyable, it’s essential to consume them in moderation. These ingredients can lead to overeating if we’re not careful, so it’s worth being mindful about how much we’re adding to our dishes, especially if managing dietary restrictions or health concerns.
The NHS recommends adults have no more than 6g of salt a day, about a level teaspoon, and no more than 30g of free sugars. Checking the traffic light labels on packs is an easy way to keep track, and you can swap in some alternatives to sugar where it makes sense. It also helps to understand why we crave food even when we're not hungry.
If you've been advised to cut down on salt or sugar for a health condition, follow your GP's advice.
Find yourself reaching for something sweet and salty every afternoon? Meals that keep you fuller for longer make a big difference, and so does tackling the afternoon energy crash. Take the ALYVE quiz to see what a personalised formula could include for you.
Conclusion
The combination of salt and sugar doesn’t just make food delicious; it taps into our biological instincts and culinary preferences. By understanding and utilising this mix properly, you can elevate your cooking and delight your palate. Just remember, like all good things, the key lies in balance and moderation. So go ahead, experiment in your kitchen and see how a little sprinkle of salt and sugar can transform your next meal into a mouth-watering masterpiece!
Want help building meals that beat the cravings? Take the ALYVE quiz, or book a call with one of our nutritionists.
References
Fazzino, T.L., Rohde, K. and Sullivan, D.K. (2019) 'Hyper-palatable foods: development of a quantitative definition and application to the US Food System Database', Obesity, 27(11), pp. 1761–1768. Available at: https://doi.org/10.1002/oby.22639
Hall, K.D. et al. (2019) 'Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial of ad libitum food intake', Cell Metabolism, 30(1), pp. 67–77.e3. Available at: https://doi.org/10.1016/j.cmet.2019.05.008
NHS (no date) Salt in your diet. Available at: https://www.nhs.uk/live-well/eat-well/food-types/salt-in-your-diet/ (Accessed: 26 October 2026).
NHS (no date) Sugar: the facts. Available at: https://www.nhs.uk/live-well/eat-well/food-types/how-does-sugar-in-our-diet-affect-our-health/ (Accessed: 26 October 2026).
