Is cold brew less acidic than hot coffee?
Yes, cold brew is generally less acidic than hot-brewed coffee. Because cold brew uses time rather than heat to extract flavor, it avoids the chemical reactions that occur at high temperatures, resulting in a smoother, less acidic cup that is often easier on the stomach for those sensitive to coffee's acidity.
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The popularity of cold brew has exploded in recent years, and one of the primary reasons cited by fans is its low acidity. When you brew coffee with hot water, the heat accelerates the extraction of various compounds, including acids and oils. While this heat is necessary to pull out the complex, bright notes of a light-roast coffee, it also extracts more of the compounds that can cause a sharp, acidic sensation on the palate and discomfort for those with sensitive stomachs.
Cold brew, by contrast, relies on a long, slow immersion process—typically 12 to 24 hours—using room temperature or cold water. Because there is no heat involved, the extraction process is fundamentally different. Many of the harsher, more volatile acids that are easily extracted with hot water simply do not dissolve into the cold water. The result is a coffee that is naturally sweeter, smoother, and significantly lower in perceived acidity.
It is important to note that 'acidity' in coffee is not necessarily a bad thing. In the world, acidity is often a desirable trait that provides brightness and complexity. However, for those who find hot coffee too harsh, cold brew offers a delicious alternative. The lower acidity also means that cold brew can be stored in the refrigerator for several days without the flavor degrading as quickly as it would with hot-brewed coffee.
If you are interested in the chemistry, the difference lies in the solubility of different compounds at different temperatures. Hot water is a much more efficient solvent, which is why hot brewing takes minutes while cold brewing takes hours. By choosing cold brew, you are essentially selecting a different set of flavor compounds to extract, favoring the deeper, chocolatey, and nutty notes over the bright, fruity, or sharp ones.
In practice, cold brew is incredibly versatile. It can be made as a concentrate, which you can then dilute with water or milk to your preferred strength. It is also a great base for iced coffee drinks. If you have been avoiding coffee because of its acidity, cold brew might just be the solution you have been looking for. It is a simple, forgiving method that consistently produces a smooth, easy-drinking cup.
- ·https://www.nature.com/articles/s41598-018-34392-6Verify source for reference 1 ↗