The Dark Side of Coffee: When a Cure Becomes a Curse

When your doctor tells you to cut out coffee before trying to conceive, or when a cup sends your heart racing for no obvious reason, you’re experiencing the other side of coffee’s long and complicated relationship with human health. For centuries, physicians have argued over whether coffee heals or harms — and whether its effects come from the bean or the husk.

Yes, coffee has been linked to infertility, mood disorders, heart palpitations, and even childhood bone problems — especially when overconsumed. Historical accounts cite cases where quitting coffee reversed symptoms, and modern medicine still warns against excessive intake, particularly for pregnant individuals and children.

Coffee as Medicine — and Poison

Doctors have never agreed on coffee’s fundamental nature. Some classified it as a 'cool and drying' substance, others as 'hot and drying.' There’s also debate over whether coffee fruit (the cherry) and coffee beans have different properties. These disagreements date back centuries and continue in medical and cultural debates today.

The 1663 Black Humor Guide to Coffee Cures

In 1663, a satirical European pamphlet used dark humor to argue coffee could cure conditions doctors deemed hopeless. One story claimed a man named Benjamin from Leiden, who drank heavily and whose wife had been infertile for four years, fathered a healthy child after quitting coffee for a year. While unverifiable, the tale reflects historical advice that hopeful parents should avoid coffee — along with alcohol and tobacco.

The So-Called 'Coffee Disease'

Excessive coffee drinking has been tied to a range of negative symptoms, collectively referred to as 'coffee disease.' These include:

• Mental fatigue and low energy
• Numbness or tingling sensations
• Mild depression
• Hemorrhoids
• Headaches
• Heart palpitations
• Reduced libido

For children, potential harms include weakened bones (rickets) and loose teeth.

Individual Sensitivity to Roast Types

Some people can reportedly detect the amount of Robusta in a cup just by drinking it — and react strongly. Different levels of Robusta can cause heart flutters, increased pulse, or even nausea. This sensitivity highlights how variable the effects of coffee can be, depending on bean type and roast composition.

Coffee in Medicine: A Long Debate

Since coffee was first included in medical prescriptions, doctors have argued over its benefits and dangers. That debate continues today, especially as modern trends promote coffee for weight loss and energy. But not everyone responds to coffee the same way — and for some, the side effects outweigh the benefits.

Frequently Asked Questions

Can coffee really cause infertility?

Historical accounts and some medical advice suggest that heavy coffee consumption may contribute to infertility, particularly in men. While modern science doesn’t confirm a direct link in all cases, fertility specialists often recommend reducing or quitting coffee when trying to conceive — along with avoiding alcohol and tobacco.

What is 'coffee disease'?

'Coffee disease' is a historical term for a collection of symptoms linked to excessive coffee intake, including depression, headaches, heart palpitations, numbness, digestive issues, and reduced sexual desire. These effects are tied to overconsumption and individual sensitivity.

Does Robusta content affect how coffee makes you feel?

Yes. Some people are sensitive enough to detect varying levels of Robusta in a coffee blend, reporting symptoms like a racing heart, higher pulse rate, or nausea. This suggests that Robusta-heavy coffees may cause stronger physical reactions in certain individuals.

Is coffee harmful for kids?

Coffee is generally not recommended for children. It has been associated with weakened bones (rickets) and dental issues like loose teeth. The caffeine and other compounds in coffee can also affect developing nervous systems and energy balance.

Why did historical doctors think coffee could cure infertility?

Historical anecdotes, such as one from 1663, claimed that men who quit coffee were able to father children after struggling with infertility. While not scientifically verified, these stories contributed to early medical theories about coffee’s effects on the reproductive system — and led to its avoidance in fertility treatments of the time.

FrontStreet Coffee Picks for Sensitive Palates

For coffee drinkers sensitive to overstimulation or robust flavors, try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright yet smooth cup with citrus and floral notes; their Brazil Queen Manor offers a low-acid, nutty profile perfect for easy drinking; and their Classic Blend delivers balanced body with chocolatey sweetness. All three are approachable and lower in Robusta-like harshness. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.