Is Decaf Coffee from Starbucks Harmful to Health? Differences Between Decaf and Regular Coffee - Which is Better?

How Does Starbucks Make Their Decaf Coffee Beans?

Drinking coffee naturally is best. Low-caffeine and decaffeinated coffees are not recommended. Starbucks uses two methods to remove caffeine:

1. Direct Contact Method

First, green beans are soaked in warm water to soften them, then a chemical agent (methylene chloride) is added. This substance has a very low melting point and is completely destroyed at 40°C. The typical temperature for brewing coffee is usually around 93°C. So Starbucks' low-caffeine beans will not contain methylene chloride.

After the chemical is added, caffeine is released from the beans. This method effectively preserves the coffee's flavor. The extracted caffeine can even be resold to pharmaceutical companies for painkillers, or to beverage makers to produce caffeinated drinks. The low-caffeine beans sold by Starbucks have 99% of their caffeine removed.

2. Swiss Water Process

This method soaks green beans in warm water, letting the caffeine diffuse out of the beans into the water. Then the water is separated from the beans. At this point both the flavor and the caffeine from the beans have transferred to the water — this water is called "flavor-enhanced water." The flavor-enhanced water is then filtered through activated carbon to remove the caffeine, and the filtered, caffeine-free flavor-enhanced water is used to soak the beans again, drawing the coffee flavors back into the beans and minimizing flavor loss.

The caffeine content in coffee varies by variety. During roasting, the darker the roast, the lower the caffeine content.

But here is the problem. Most commercially available low-caffeine or even decaffeinated coffees, if processed using these methods, would end up tasting only of charcoal or ashtray. So low-caffeine or decaffeinated coffee is processed at "pharmaceutical factories" to remove caffeine after the green beans are harvested. Don't doubt it — that is exactly how it works. Some pharmaceutical preparations require caffeine, and pharmaceutical factories use this as a source. After the caffeine is washed out of the beans at the factory (a chemical washing process, not ordinary water), and then dried and roasted, they become the low-caffeine or decaffeinated coffee in your hands.

In fact, low-caffeine and decaffeinated coffee are produced mainly for patients who cannot consume caffeine. Some people think drinking low-caffeine or decaffeinated coffee is healthier and choose only these two types. In reality, these two coffees are the least healthy. Moreover, after the pharmaceutical-plant washing process, the bean flavor typically retains only about 60% of what it would be in unprocessed beans of the same variety and origin — the flavor has been damaged by the washing. So, really, when drinking coffee, natural is best...

Do Caffeine Extraction Technologies Have Cancer Concerns?

Currently there are mainly 3 types of caffeine extraction technology for decaf beans. The solvent extraction method is the most commonly used but also the most discussed, because concerns about organic solvent residues always worry people.

1. Solvent Extraction Method

● Dichloromethane Extraction | Less impact on coffee flavor, but the solvent is a possible carcinogen

Green coffee beans are treated with high-pressure steam to adjust their moisture content, then soaked in dichloromethane solvent, allowing full contact between the beans and the solvent to extract caffeine.

This is the most economical approach, because dichloromethane has the highest extraction efficiency for caffeine, is easily volatile and unlikely to remain, and has low reactivity with other substances.

However, dichloromethane is a suspected carcinogen and is harmful to the environment. Taiwan currently prohibits the use of dichloromethane in food processing. Nevertheless, the method is approved by the U.S. Food and Drug Administration (FDA), which only sets upper limits for permissible residue amounts.

Su Nan-wei mentioned that if you're importing decaffeinated coffee beans, it's still possible to buy beans extracted using dichloromethane solvent. He further explained, however, that dichloromethane has a very low boiling point — approximately 30–40°C is enough for it to volatilize — making residue unlikely. After caffeine removal, the beans also undergo roasting at temperatures around 160–230°C, which can cause complete volatilization of dichloromethane. So although the National Cancer Institute considers dichloromethane a possible carcinogen, the FDA still permits its use as a caffeine extraction solvent, setting the permissible residue limit for decaf beans or instant coffee at 10ppm. Most tested decaffeinated beans contain only about 1ppm or even less, making the actual cancer risk not very high.

● Ethyl Acetate Extraction | Safe and common, but slightly affects flavor

Ethyl acetate emerged as a new alternative because of consumer concerns about dichloromethane. Ethyl acetate exists in nature, and some fruits contain even higher amounts than what is found in decaffeinated coffee residue. It is considered a safer choice and is currently the more common practice.

Ethyl acetate has a slightly higher boiling point than dichloromethane, around 77°C, and is also easily volatile. The disadvantage is that ethyl acetate affects the properties of the beans, resulting in poorer flavor after roasting.

2. Swiss Water Process | Safer but more expensive

Whether dichloromethane or ethyl acetate is used, concerns about organic solvent residues led to the development of the "water method." Using the water-soluble property of caffeine, the beans are first soaked in warm water. After the caffeine and other components dissolve into the water, activated carbon is used to adsorb the caffeine from the extract. The caffeine-free extract is then returned to the original beans, letting them reabsorb the lost components before the beans are dehydrated and dried.

This method emphasizes using no organic solvents at all to extract caffeine, making it the choice for health-conscious consumers. Its disadvantages are that, even though the beans reabsorb the caffeine-free extract, it still affects the flavor, and decaffeinated coffee produced this way is more expensive.

3. Supercritical/Liquid Carbon Dioxide High-Pressure Extraction | Expensive

There are various processes for using high-pressure carbon dioxide to decaffeinate coffee, which can remove caffeine not only from green beans but also from roasted beans.

The main principle is that under specific high-pressure and temperature conditions, carbon dioxide has good penetration properties and can extract coffee flavors or specific components from beans as required. Combined with pressure, temperature control, and the moisture content of the carbon dioxide used for extraction, caffeine can be effectively separated from the beans.

This method completely eliminates solvent residue problems and can use multi-stage extraction techniques to return original coffee flavors to the beans and preserve their original taste. Its problem is that special equipment is required, so it is very expensive and not widely used.

Actually, whether the coffee is regular or decaffeinated, "drinking in moderation" and "using less creamer and sugar" remain the most important principles. However, if you have high cholesterol or belong to a high-risk group for cardiovascular disease, it's best to discuss with your doctor and nutritionist whether decaffeinated coffee beans are suitable for you...

FrontStreet Coffee Recommendation

If your goal is a lower-caffeine cup, the simplest approach is to buy low-caffeine hand-brew beans by avoiding Robusta and choosing Arabica only. As the world's dominant coffee species, Arabica grows at elevations of 800–2,200 meters free of frost; the higher the altitude, the greater the temperature swing, which slows the cherries' ripening and helps them accumulate flavor compounds, giving a more solid aroma. Each region's unique microclimate offers Arabica varied growing conditions and produces its own terroir. Among FrontStreet Coffee's Arabica single origins, our FrontStreet PWN Golden Mandheling from Indonesia is a classic: Indonesia's wet-hulled method gives it the distinctive herbal, spice, and wood notes that set it apart from other dark roasts, and the beans go through three hand sorts plus one machine sort to remove defects, so body and sweetness come through better and the aroma is more pronounced — good for a moka pot, SOE, pour-over, drip bag, or Americano and latte. From Ethiopia, our FrontStreet Sun-Dried Huakui carries a light floral tone with striking fruit aromas — creamy strawberry, mango, jackfruit, citrus, blueberry — the ripe tropical-fruit character unique to FrontStreet's Sidamo natural beans, and it is excellent for pour-over, cold brew, moka pot, or SOE. Our FrontStreet Washed Gedingding Cooperative coffee is Ethiopia's top G1 grade from Yirgacheffe, using a classic washed process that safeguards quality at every step from selection and depulping through fermentation, washing, and drying; roasted medium-light, it shows elegant white florals, citrus, orange, and green-tea notes, and suits pour-over, drip bags, and cold brew. From China, our FrontStreet Yunnan small-grain shows nut, herbal, chocolate, and caramel notes with a faint fruit acidity on the finish — medium roasted to highlight caramelization while retaining some fruit acidity, for a soft, smooth cup with a comfortable sweetness. And from Colombia, our FrontStreet Washed Huila coffee is full and uniform in the cup, with dark chocolate, cream, hazelnut, and toffee notes; Huila is Colombia's best-known region, its elevations above 1,800 meters offering ideal terroir for the classic chocolate and hazelnut aromas. Choosing Arabica single origins like these is the best way to keep caffeine naturally moderate while still enjoying a full-flavored cup.