Difference Between Bitter and Sour

The human tongue is capable of perceiving five basic tastes, namely sweet, bitter, sour, salty and savoury or umami. Each of these tastes can be detected by our taste buds utilizing specialized taste receptors for each.


Food Quiz

Test your knowledge about topics related to food

1 / 10

What is a 'seagan'?

2 / 10

What type of measuring unit is most commonly used in recipes?

3 / 10

A Substance Needed By The Body For Growth, Energy, Repair And Maintenance Is Called A _______________.

4 / 10

What type of bread is a staple in French cuisine, typically served with soup or salads?

5 / 10

Which food group is mostly consumed by teens due to the large amount of calcium?

6 / 10

What is the main ingredient in honey?

7 / 10

What type of oven is best for making cakes and baked goods?

8 / 10

Which one is unhealthy?

9 / 10

Which type of pizza is topped with tomato sauce, mozzarella cheese, and other toppings of your choice?

10 / 10

What type of sweet dish is typically served after the main course of a meal to complete the dining experience?

Your score is


Key Takeaways

  1. The bitter taste is generally described as unpleasant, sharp, disagreeable, and often associated with natural toxins and poisons.
  2. On the other hand, sour taste is a pleasant but sharp and acidic taste often associated with fruits like lemon and grapefruit.
  3. The bitter taste is sensed by taste buds at the back of the tongue, while the taste at the sides of the tongue senses the sour taste.

Bitter vs Sour

The difference between bitter and sour is in its taste or perception and the taste receptors they activate in the taste buds on the tongue. Bitter is a strong, sharp, pungent taste that is mostly not likeable, while sour is a milder acidic taste that is mostly considered pleasant.

Bitter vs Sour

Want to save this article for later? Click the heart in the bottom right corner to save to your own articles box!

Bitter is the taste of any alkaline substance meaning any substance with a pH above 7 to 14. It is the strongest taste in humans and is perceived by all the taste buds in the tongue.

It is perceived by all the taste buds of the tongue and is perceived by a group of taste receptors cells (TRCs) that have ion channels to communicate messages to the gustatory nerve.

Comparison Table

Parameters of ComparisonBitterSour
Nature of TasteAlkaline taste; sharp and pungent.It is a milder acidic taste.
SensitivityIt is the most sensitive taste for humans.It is like the other regular tastes for humans.
pH SensitivityThe taste of eatables between 7-14 is perceived as bitter by the brain.The taste of eatables between 1-7 is considered sour by the brain.
Taste ReceptorSpecialized G protein-coupled receptors in the taste bud called TAS2Rs or T2Rs.Specialized taste receptors cells communicate through ion gated channels.
LikabilityBitter is considered an unpleasant taste to witness.Sour is considered a more or less pleasant flavour in small amounts often also treated as a delicacy
Detoxification of Body CellsBitter things are known to detoxify body cells like the liver, pancreas etc.Sour foods do not have any such effect.
Stimulation of AppetiteBitter things owing to their bad taste often reduce the appetite of the consumer.Sour things are known for being served as appetizers.
ExamplesBitter chocolate, coffee, bitter gourd, vegetable and fruit peels etc.Lemons, citrus fruits or any food with known acids.

What is Bitter?

Bitter is the name used to describe the flavour of alkaline substances with high pH. This flavour is detected by guanine nucleotide-binding protein receptors that activate by coupling a bitter molecule to its active site.

 The brain is highly sensitive to bitter substances, probably due to an evolutionary adaptation as most naturally occurring poisons and toxins are bitter in taste.

However, having bitter foods have its own advantages. For example, butter foods activate our taste buds, and this helps us taste better.

Some bitter foods are also known to have antibacterial and antimicrobial properties like neem and haldi. Bitter food often reduces appetite and are paired with a diet for weight loss.

To compare bitterness of a substance, we measure it in terms of how bitter it is in comparison to quinine, whose level of bitterness is considered as 1.


What is Sour?

Sour is the name used to describe the flavour of acidic substances. Any acid is a substance that has a pH lower than 7. All acids taste sour.

The cells detect sourness with the help of ion gated channels in their membranes that respond to specific ions like metals or hydrogen in the case of sour food.

The brain responds accordingly. Sourness is a milder taste compared to bitterness and is almost always considered tasty. For example, lemon juice, pickles, sour candies etc., are delicacies.

Some advantages of consuming sour foods are they help in increasing metabolism, and this weight loss triggers salivation, helps in ion absorption (malic acid), calcium intake ( lactic acid) etc.

Hydrochloric acid serves are the sourness index which means a comparison of sourness of food is made with hydrochloric acid whose measurement is considered as 1.


Main Differences Between Bitter and Sour

  1. The bitterness index is measured by quinine, while the sourness index is measured by hydrochloric acid. Each of whose indexes is 1.
  2. Bitter foods help in detoxifying cells, while sour foods help in weight loss.
Difference Between Bitter and Sour
  1. https://europepmc.org/article/med/16732425
  2. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1750-3841.2007.00282.x
  3. https://www.sciencedirect.com/science/article/pii/S0022532065801034
One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️

Leave a Comment

Your email address will not be published. Required fields are marked *