The Science of Sweetness: How We Perceive Sugar


Sweetness is one of the five basic tastes, along with saltiness, sourness, bitterness, and umami. Humans have a wide range of sweet receptors in our taste buds which allow us to detect the presence of sugar and other sweet compounds.

As foods that taste sweet are closely linked to energy, they have been important for survival throughout human evolution as they can signal the presence of foods high in calories.

The science of sweetness is an area of study that looks at how humans perceive different levels of sweetness. This article will explore why this perception is important and what research has revealed about our sense of taste when it comes to sweet food and drinks.

Sweet Perception: What Does It Reveal?

Humans have a natural preference for sweets, which is likely rooted in evolutionary biology. Historically, sweet tastes were a way for us to seek out and consume essential nutrients. In the past, natural sugars could be scarce and difficult to access, making sweetness an important indicator of energy-rich foods that were beneficial for survival.

The ability to distinguish between various levels of sweetness helps us discern nutritious fruits from potentially poisonous substances. However, this instinctive preference can also lead to overeating or unhealthy habits when presented with sugary foods and drinks.

The good news is that research has identified several factors which affect how we perceive sweetness. Taste buds, for example, can be affected by genetics as well as the amount of sugar present in a food or beverage. As a result, people may have different levels of sensitivity to sweet flavours due to their individual physiology and psychological makeup.

The Impact of Sugar Content

Sugar content is also an important factor in determining how sweet a food or beverage tastes. Generally, the higher the sugar content of a food or drink, the sweeter it will taste. However, this varies depending on the type of sugar used and its concentration within the product.

For example, fructose, a natural sugar found in fruit, is sweeter than table sugar (sucrose), so foods containing fructose can taste much sweeter even at lower concentrations.

The Physiology of Sweetness

The physiology of sweetness involves several different processes. Firstly, when sugar molecules interact with the specialised taste receptors on our tongues, they produce the receptor protein TAS1R2/3.

This protein is then converted into a signal that travels to the brain, where it is processed and identified as sweetness. On its journey from the taste receptors to the brain, the signal passes through several steps including decoding by different neural pathways, modulating of neurotransmitters and integration of information in various parts of our brain.

This triggers the release of hormones such as insulin, which help regulate blood sugar levels. Additionally, foods and drinks that taste sweet stimulate the production of neurotransmitters such as dopamine, which can cause feelings of pleasure and reward when eaten.

Understanding the complex interactions between our physiology, genetics and psychology when it comes to sweet tastes can help us make more informed decisions about how we consume sugary foods and drinks. By recognising our individual preferences and sensitivities, we can be mindful of our consumption patterns and strive for a healthier relationship with sugar.

Theories of Sweetness

Proposed in 1991 by Jean-Marie Tinti and Claude Nofre, multipoint attachment theory has been critical in the development of modern sweeteners, including lugduname: the sweetest compound on the planet.

This theory suggests that sweetness is based on the attachment combination of a sugar molecule to a taste bud receptor, rather than simply the sugar content of a food or drink.

In general, multipoint attachment theory posits that more attachments mean greater sweetness perception and vice versa. This means that low-sugar options can still taste sweet if they contain molecules which attach easily to receptors in the tongue – making them an attractive option for those looking for healthier, lower-sugar alternatives.

Understanding Sweet Tastes: The Role of Psychology

In addition to genetic and physiological factors, our perception of sweetness is also influenced by psychological factors. Our expectations and past experiences with sweet flavours play an important role in determining how we perceive sweetness.

For example, if we enter a situation expecting something to be sweet, that expectation can lead us to experience it as sweeter than it actually is. Additionally, our taste preferences are also shaped by our culture and environment – meaning what may seem sweet to one person may not be sweet to another.

Types of Alternative Sweeteners

In addition to natural sugars, there are various artificial sweeteners available on the market. High-potency sweeteners and low-calorie sweeteners are popular replacements for sugar to replicate a sweet taste in many processed foods, drinks and even medications.

By activating taste cells in the same way as sugar molecules, these sweeteners can provide a sweet taste without increasing the caloric content of foods.

Despite having a sweet taste, studies have shown that many alternative sweeteners may not induce the same feelings of pleasure and reward as sugar. This means that although they can help reduce overall sugar intake, in many cases they are not a replacement for natural sugars in terms of providing satisfaction or enjoyment from eating sweet foods.

Popular artificial sweeteners include:


Aspartame is an artificial sweetener that is around 200 times more sweet than sugar. It is most commonly used in diet sodas and other reduced-sugar drinks, as well as many sugar-free desserts.


Saccharin is a very sweet artificial sweetener around 300 to 400 times sweeter than sugar. It is mainly used in baking and other food products as well as medicinal syrups or lozenges.


Sucralose is an artificial sweetener around 600 times more sweet than sugar. It is most commonly used in many foods, including soft drinks, dairy products and baked goods.


Stevia is a natural sweetener around 200 to 300 times sweeter than sugar. It is extracted from the leaves of the stevia plant and is used in many foods, beverages and table-top sweeteners as an alternative to sugar or artificial sweeteners.

Natural Sugar Alternative

Aromatech Sensugar®

Aromatech's Sensugar® is a natural flavour containing no additive and no Stevia found in some sugar replaces, avoiding the metallic bottom notes often found in reduced-sugar products. Sensugar® allows approximately 25% sugar substitution in different food and beverage applications, by enhancing the existing sugar notes and enhancing the sweetness perception.

Sensugar® is an ideal choice for those aiming to lower their intake of sugar without compromising on taste. It has a clean, sweet and pleasant taste profile that enables manufacturers to reduce added sugar in products while still delivering a great-tasting product.


The science of sweetness is a complex, multi-faceted phenomenon that involves both the physiology and psychology of taste.

Alternative sweeteners can provide a sweet taste without increasing the caloric content of foods, however, they are not a suitable replacement for natural sugars when it comes to providing enjoyment or satisfaction.

Aromatech’s Sensugar® is a natural sugar alternative that allows manufacturers to reduce added sugar in products while still delivering a great-tasting product. It provides an ideal solution for those aiming to reduce their sugar intake without compromising on taste.

At Uren, we understand the importance of taste and providing solutions to reduce sugar in products. Working in close partnership with Aromatech, we can provide you with tailor-made formulations to suit your product needs. Get in touch today to find out more.