Caffeine Intolerance: Signs and Symptoms

What is caffeine?

Caffeine is a small molecule present, not only in coffee, but also many different types of teas (except herbal teas); including green tea; energy drinks, enhanced waters and colas. These types of drinks form the mainstay of many peoples’ fluid intake, but few really stop and think about the effect that caffeine can have on health and well-being.

What are the symptoms of caffeine intolerance?

Due to the molecular structure of caffeine, once ingested, it is transported very quickly around the body; this is the instant caffeine “hit” that you get that perks you up. You may think than you need that “wake up” hit, in the end caffeine is addictive so “need” is the right word, however, there are many more negative effects of caffeine than you may imagine. These negative effects can become part of normal life; can you identify with any of these?

  • Insomnia
  • Anxiety
  • Restlessness and restless legs
  • Headaches or migraines
  • Palpitations and racing heart
  • Fatigue
  • High blood pressure
  • Irritable bowel syndrome (IBS)

Can you have a caffeine intolerance?

The question is how much caffeine is safe to drink? As with most food intolerances, and reaction to caffeine is classed as an intolerance not an allergy, the answer to this question depends very much on the individual. People are affected by caffeine in different ways; some are much more sensitive than others and have to adjust their intake accordingly. General guidelines say that 4-5 cups of coffee per day is fine, but this may be far too much for some, with symptoms appearing even with the smallest amounts. Of course the caffeine content of a cup of coffee depends on how big the cup is, how finely the coffee is ground, how dark the roast, the brewing method used, how much coffee is used to make the drink and the type of coffee bean used etc. etc.

Caffeine-containing drinks are addictive and the thought of stopping or reducing coffee/caffeine content may be too much to bear, even for those suffering from symptoms. Withdrawal symptoms include headache, irritability, inability to concentrate, drowsiness, insomnia, and stomach pain may appear within 12 to 24 hours after stopping caffeine intake, peak at roughly 48 hours, but usually only last a few days; well worth it for the benefits you might feel to your long-term health.

If you do suffer from symptoms such as IBS, headaches, migraines, lethargy or anxiety, it may not just be the caffeine that is causing the problem. It is estimated that 45% of the population suffer from food intolerance; food intolerance includes sensitivity to small molecules (chemicals) such as caffeine but also reactions to some large molecules (proteins) in foods.

For example it may not be the caffeine in your coffee causing the problem but the coffee beans themselves, or the added milk, or indeed not the coffee at all but reactions to other foods that you are eating. One approach that can be used is to change your diet removing foods identified using a simple blood test for reactions to these large protein molecules in foods (a food-specific IgG test).

We test for coffee intolerance:

One approach that can be used is to change your diet removing foods identified using a simple blood test for reactions to these large protein molecules in foods (a food-specific IgG test).

Here at YorkTest, we not only test for coffee intolerance, but to 207 other food and drink ingredients. Our programmes require only a few drops of blood through a simple home-to-lab finger-prick test, similar to a glucose test used by diabetics, and is then sent off to our in-house laboratory for testing.

Learn more by scrolling through the below.

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Emily Catterall, 24: IBS

“I feel like I’m in a new body! I’m so much healthier. I can’t tell you how amazingly different I have felt since!”


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Sally Gunnell OBE, 52: Energy levels

“I’m not waking up as much during the night, not as bunged up in my nose and I’ve got so much more energy”


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Symptoms of a Food IntoleranceFood intolerance symptoms can be wide-ranging, from IBS-type complaints to skin issues, such as eczema and itchy skinClick HereWhy Not Take The FirstStep?At just £24.99, this gives you a positive or negative pre-screen for general food intolerance† Click Here

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