01 Why Coffee Causes Afternoon Crashes & What To Do About It
By BloomRenew Wellness Team | May 2026 | 8 min read
In This Article
- The Cortisol-Caffeine Connection
- Why Afternoon Crashes Happen
- Why More Coffee Makes It Worse
- How Functional Mushrooms Help
- A Better Energy Strategy
You know the routine. You pour your first cup at 7am and feel genuinely awake. By 10am, you're thinking clearly. Then somewhere between 2pm and 4pm, the wall hits.
Not exhausted exactly — just foggy, unmotivated, and reaching for another cup of coffee.
If this sounds familiar, you're not alone. And there's a real physiological reason your coffee habit may be working against you later in the day.
The Cortisol-Caffeine Connection
Your body already produces a natural energy spike every morning called the cortisol awakening response (CAR).
Cortisol naturally rises within 30–60 minutes of waking to help you feel alert and ready for the day.
The problem is that caffeine stimulates a very similar stress-response pathway. When you drink high-caffeine coffee during your natural cortisol peak, you're essentially stacking stimulation on top of stimulation.
The result often isn't better energy — it's a sharper peak followed by a deeper crash later in the afternoon.
Research has shown caffeine temporarily increases cortisol levels, especially in people already under stress.
Why More Coffee Makes It Worse
1. Adenosine Builds Up
Caffeine blocks adenosine — the chemical responsible for sleep pressure and tiredness. But adenosine doesn't disappear. It accumulates while caffeine is active.
Once caffeine wears off, that built-up adenosine hits all at once, creating the classic afternoon crash.
2. Your Evening Rhythm Gets Disrupted
Late-day caffeine can delay your body's natural cortisol decline, leaving you feeling "tired but wired" at night.
3. Tolerance Keeps Increasing
Over time, your brain creates more adenosine receptors, meaning you need more caffeine just to feel normal.
This isn't a willpower issue. It's simply how the biology works.
How Functional Mushrooms Support Energy Differently
Cordyceps (Cordyceps militaris)
Cordyceps supports ATP production — the cellular energy system your body actually uses for sustained performance.
Unlike caffeine, ATP support doesn't create the same rebound crash later in the day.
Maitake (Grifola frondosa)
Maitake may help support more stable blood sugar levels, which plays a major role in afternoon energy stability.
Reishi (Ganoderma lucidum)
Reishi helps support a more balanced stress response through the HPA axis — the same system caffeine tends to overstimulate.
A Smarter Energy Strategy
Many people don't actually need more caffeine. They need a better energy curve.
Lower caffeine paired with functional support often feels dramatically different than high-dose coffee alone.
At around 48mg of caffeine, many people still feel alert and focused — but without the anxiety, jitters, or afternoon collapse associated with stronger coffee.
Combined with functional mushrooms, MCTs, and a smoother glucose response, the experience becomes more stable and sustainable.
Try BloomRenew Mushroom Coffee
✔ Lower-Caffeine Energy Support
✔ 6 Organic Functional Mushrooms
✔ Fruiting Body Extracts
✔ Calm Focus Without the Crash
What People Commonly Notice
- Less jitters and anxiety
- More stable focus throughout the day
- Fewer afternoon crashes
- Better digestion compared to regular coffee
- A calmer, smoother morning routine
Many users describe it as "cleaner energy" rather than overstimulation.
FAQ
Why do I crash after coffee? |
| The crash is often caused by adenosine buildup, cortisol fluctuations, and blood sugar instability. |
Does mushroom coffee still contain caffeine? |
| Yes, but typically much less than standard coffee. |
Can functional mushrooms replace caffeine? |
| Not exactly. Functional mushrooms support energy differently by helping the body's stress and energy systems function more efficiently. |
Is mushroom coffee better for anxiety? |
| Many people report fewer jitters and less overstimulation compared to regular coffee, especially with lower caffeine intake. |
The Bottom Line
The afternoon crash isn't necessarily a sign that you need more coffee. Often, it's a sign that your current caffeine routine is too aggressive for your body's natural rhythm.
A lower-caffeine approach supported by functional mushrooms may create steadier energy, calmer focus, and a much smoother day overall.
These statements have not been evaluated by the Food and Drug Administration (FDA). This product is not intended to diagnose, treat, cure, or prevent any disease.
References:
Hughes JR et al., Archives of General Psychiatry, 1991
Marin MF et al., Neurobiology of Learning and Memory, 2011
Hirsch KR et al., Journal of Dietary Supplements, 2017
Related Reading
Want to learn more about what makes mushroom coffee different? Check out our guide on What Is Mushroom Coffee? to explore the science behind functional mushrooms and how they complement a balanced energy routine.
