Coffee is a part of life for many, but despite this, many myths about coffee are widely believed.
From caffeine levels to acid reflux and hydration, myths about drinking coffee still shape how people brew and consume it.
Whether you’re brewing at home, choosing between espresso and filter coffee, or considering a decaf option, understanding the facts makes every cup more enjoyable.
Let’s separate assumptions from evidence.
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1. Dark Roast Coffee Has More Caffeine
Dark roast tastes stronger. That doesn’t mean it contains more caffeine.
Caffeine content is influenced more by bean type, dose and brew method than roast level. Light roast coffee beans are slightly denser, which means by weight they can contain marginally more caffeine.
If you’re choosing dark roast for energy, focus on:
• Dose size
• Brewing ratio
• Serving volume
2. Tea Has More Caffeine Than Coffee
This myth might have come about as tea leaves naturally contain more caffeine than coffee beans. However, the way tea is prepared changes the situation.
In reality, brewed filter coffee typically contains more caffeine per cup than black tea or green tea.
Average caffeine per 240ml cup:
• Brewed coffee: 80 to 120mg
• Black tea: 40 to 50mg
• Green tea: 20 to 45mg
Tea contains L-theanine, which slows caffeine absorption and softens stimulation. That’s why it feels smoother.
3. Decaffeinated Coffee Contains No Caffeine
Decaf reduces caffeine significantly. It does not remove it entirely.
A standard cup of decaffeinated coffee contains around 2 to 7mg of caffeine compared to 80 to 120mg in regular brewed coffee.
Modern processes such as the Swiss Water Process and CO2 extraction remove caffeine while preserving flavour.
4. Coffee Will Sober You Up
Coffee increases alertness. It does not reduce blood alcohol concentration.
Caffeine stimulates the central nervous system. Alcohol depresses it. The stimulation may mask fatigue, but it doesn’t restore coordination or reaction time. You are probably better off with a glass of water and a good nap.
5. Coffee Dehydrates You
Coffee contains caffeine, which has mild diuretic effects. However, research shows moderate consumption contributes to overall hydration.
Coffee is mostly water. Regular drinkers develop tolerance to caffeine’s diuretic effect.
A few cups per day will not meaningfully dehydrate healthy adults. Hydration guidance from the NHS: https://www.nhs.uk/live-well/eat-well/food-types/water-drinks-nutrition/
6. Coffee Helps You Lose Weight
Caffeine can slightly increase metabolic rate and support exercise performance. The effect is modest.
Coffee alone does not create meaningful weight loss. Added syrups and sugar increase calorie intake quickly. There’s no harm in including it as part of a healthy lifestyle, but on its own coffee won’t help you lose weight.
7. You Should Always Use Boiling Water
Boiling water at 100°C can over-extract coffee and increase bitterness.
The ideal brewing temperature sits between 90 and 96°C. Letting your kettle rest briefly before pouring can improve flavour balance.
If you’re experiencing bitterness in your morning brew, temperature and grind size are often the cause rather than bean quality.
8. Fresh Coffee Should Be Used Immediately After Roasting
Fresh coffee needs time to rest.
After roasting, coffee releases carbon dioxide through degassing. Brewing too soon can result in uneven extraction and sharp flavour.
Most speciality coffee benefits from resting several days before brewing, particularly for espresso.
9. Freezing Coffee Ruins It
Freezing does not automatically damage coffee.
If whole beans are stored in airtight containers and portioned correctly, freezing can slow oxidation and protect freshness.
The main threats to flavour are:
• Oxygen
• Heat
• Light
• Moisture
Good storage matters more than freezer temperature alone.
What Actually Matters When Choosing And Brewing Coffee
Instead of worrying about myths about drinking coffee, focus on:
• Moderate caffeine intake, generally under 400mg per day for healthy adults
• Proper brewing temperature
• Consistent grind size
• Airtight storage
• Paying attention to personal sensitivity
Coffee isn’t extreme. It’s nuanced.If you’re looking to improve the quality and consistency of coffee in your workplace or hospitality setting, explore our wholesale coffee range, commercial coffee machines and barista training.
FAQs
Is cold brew healthier than hot coffee?
Cold brew isn’t necessarily healthier, but it can taste smoother and less acidic to some people.
Does adding milk change caffeine levels?
Milk doesn’t change caffeine content. It can soften flavour and reduce perceived bitterness, but the caffeine remains the same.
Why does coffee taste bitter at home but better in cafés?
Bitterness often comes from boiling water, incorrect grind size or poor storage. Small adjustments in brewing temperature and grind consistency can transform flavour.
Is instant coffee worse than fresh coffee?
Instant coffee contains caffeine and antioxidants like brewed coffee.
Can I drink coffee on an empty stomach?
Some people tolerate it well, while others experience discomfort. If you notice reflux or nausea, try having coffee with food or reducing strength.