Brewing method changes coffee’s chemistry more than it changes its core health story. Cold brew and hot brew turn out to have more similar acidity than most marketing suggests, though small differences do show up depending on roast and steep time. Filtration, not temperature, is what matters most for cholesterol, with paper filters trapping compounds that French press and unfiltered methods let through. Hot brewing tends to pull out somewhat more antioxidant activity than cold steeping does. None of this makes one method “better” across the board; it depends on what someone is optimizing for.

The Short Answer: Brewing Method Matters Less Than People Think

It’s easy to assume that hot and cold brewing produce two fundamentally different beverages, chemically speaking. The research tells a more modest story. Most of what defines a coffee’s health profile, caffeine content, chlorogenic acids, antioxidant compounds, comes from the bean itself, the roast, and the ratio of coffee to water. Brewing temperature shifts some of these numbers at the margins. It rarely overturns them.

That’s a useful thing to know before getting into the specifics, since a lot of cold brew marketing leans on claims that don’t hold up well against the data.

Acidity: Why Cold Brew Is Lower (and What That Means)

The most repeated claim about cold brew is that it’s dramatically less acidic than hot coffee, sometimes cited as 60 to 70 percent less. The actual peer-reviewed measurements tell a narrower story. A 2018 study published in Scientific Reports by researchers at Thomas Jefferson University measured pH directly in hot and cold brews made with the same coffee-to-water ratio and found the values were largely comparable, both falling in a similar range on the pH scale. A separate 2020 study looking at roast level found that cold brew was modestly less acidic than its hot-brewed counterpart at every roast level tested, but the differences were measured in fractions of a pH point, not dramatic swings.

Put simply: cold brew is somewhat less acidic, not categorically different. People who find hot coffee harsh on the stomach may still notice cold brew sits easier, since pH is only part of how acidity is perceived; cold brew’s smoother mouthfeel and lower bitterness can make it taste less sharp even when the measured acidity is close. For most drinkers, the difference is more about comfort and perception than a meaningful health distinction.

Filtered vs. Unfiltered: The Cafestol/Cholesterol Story

This is where brewing method actually does matter, and it has less to do with temperature than with filtration. Coffee beans naturally contain diterpenes called cafestol and kahweol, compounds that have been shown in controlled studies to raise LDL cholesterol. Paper filters trap most of these compounds before they reach the cup. French press, Turkish coffee, and boiled coffee, none of which use a paper filter, let significantly more through.

A 2025 study from Uppsala University measured cafestol and kahweol levels across workplace brewing machines and home methods and found that French press and percolator coffee carried meaningfully higher diterpene levels than paper-filtered drip coffee, with boiled, unfiltered coffee carrying the most by a wide margin. Earlier controlled research found that drinking several cups of unfiltered cafetiere coffee daily raised LDL cholesterol by roughly 9 to 14 percent over a matter of weeks, an effect that reversed once people switched back to filtered coffee.

Cold brew and hot brew can both be made filtered or unfiltered, so this isn’t really a cold-versus-hot distinction. It’s a filtered-versus-unfiltered one, and it’s the more consequential health difference among brewing methods generally.

Caffeine and Antioxidant Differences Across Methods

Cold brew is often assumed to be much higher in caffeine than hot coffee, largely because of how concentrated cold brew concentrate looks before it’s diluted. The Thomas Jefferson University research found caffeine levels between hot and cold brews were closer than the popular comparisons suggest, with the brewing ratio and steep time mattering more than temperature alone.

Antioxidant activity tells a slightly different story. The same research found that hot brewing extracted more of certain acids associated with antioxidant activity than cold brewing did, suggesting hot coffee may edge out cold brew on this particular measure, though both retain meaningful antioxidant content compared to many other beverages.

Which Method Best Preserves the Benefits?

There isn’t a single winner. If lower acidity and a smoother feel on the stomach are the priority, cold brew has a modest edge. If maximizing antioxidant extraction is the goal, hot brewing comes out slightly ahead. If long-term cholesterol is the concern, filtration matters far more than temperature, which means a paper-filtered hot brew or a paper-filtered cold brew will outperform an unfiltered version of either.

For most people drinking coffee as part of a normal routine, none of these differences are large enough to dictate a choice. They’re useful to know, not rules to follow.

How Maui Coffee Recommends Brewing

Brewing method matters less when the coffee underneath it is fresh and well-roasted. A freshly roasted, well-sourced coffee tends to hold its character whether it’s pulled through a paper filter, steeped cold overnight, or pressed in a French press, since the sweetness and balance come from the bean and roast first. [Insert link to existing cold brew article — TCS_0015]

FAQ

Is cold brew really less acidic than hot coffee?

Somewhat, but not dramatically. Measured pH values for hot and cold brew are closer than popular claims suggest, though cold brew shows a modest edge depending on roast and steep time.

Does French press coffee raise cholesterol?

Research suggests it can, since French press doesn’t use a paper filter to trap cholesterol-raising compounds called cafestol and kahweol. Paper-filtered methods trap most of these compounds before they reach the cup.

Does cold brew have more caffeine than hot coffee?

Not necessarily. Caffeine content depends more on the coffee-to-water ratio and steep time than on temperature alone, and the gap between methods is often smaller than assumed.

Which brewing method is healthiest?

There isn’t one clear winner. Filtered methods tend to be better for cholesterol regardless of temperature, while the differences in acidity and antioxidants between hot and cold brewing are real but modest.

Brewed hot, steeped cold, or pressed in between, the character of a good cup starts with the bean.