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Why Coffee Makes You Wired — and Then Crashes You: Adenosine Explained
☕ Adenosine, Coffee & Why Tiredness Is Supposed to Happen
Midlife Mayhem Podcast
It’s Christmas week 🎄 and just a few weeks until my programs begin for the new year.
If you’d like to see my full 2026 schedule, you’ll find it at:
👉 www.JoanneLee2026.com
🚀 Programs Starting Soon
5-Day Peak Shred
📅 January 12–18
A powerful 5-day reset with:
Coaching calls
Structure
Momentum
Yes, weight loss — but so much more than that
January is the only time this program is running early in the year.
👉 www.5DayShred.com
🎟 10% off if you join before Jan 1
Use code: PEAK
Victory Vault
📅 Starts January 26 | Runs for 2 weeks
A once-a-year program focused on:
Identity
Standards
Discipline
Who you need to be to achieve what you want
This is not goal-setting.
This is doing the internal work that makes goals inevitable.
👉 www.YourVictoryVault.com
The Perfect 10 (Applications Open)
🗓 Starts March 1
A 10-month immersive coaching experience for 10 women who want:
High-level coaching
Long-term consistency
Deep, aggressive support
If you’re interested, email me to discuss fit and details.
🎙 Episode Topic: Adenosine, Coffee & Energy in Midlife
This episode came about very organically — a stale cup of coffee on my desk and a realization that I haven’t really talked about adenosine, and you cannot talk about coffee without talking about adenosine.
So today we’re winging it — and breaking this down in a way that actually makes sense.
😴 Why We Naturally Get Tired as the Day Goes On
Adenosine is the system that controls natural tiredness.
It builds up in the brain the longer we’re awake.
Not because the body releases it intentionally — but because it’s a by-product of energy use.
Every time your brain works, thinks, focuses, or stays alert, it burns energy.
That energy currency is called ATP (adenosine triphosphate).
As ATP is used, adenosine accumulates.
As adenosine builds up, it attaches to receptors in the brain — and once enough of those receptors are occupied, the message is clear:
It’s time to slow down.
That heavy-eyed feeling in the evening?
That drop in motivation?
That “I just can’t do one more thing” sensation?
That’s not weakness.
That’s adenosine doing its job.
⚡ How Coffee Actually Works (and What It Doesn’t Do)
Caffeine does not give you energy.
It does not fix fatigue.
What caffeine does is block adenosine receptors.
Adenosine is still present — but it can’t attach.
So the brain doesn’t receive the tiredness signal.
You don’t suddenly have more energy.
You’ve just silenced the message that says you’re running low.
That’s why coffee can make you feel:
Alert and exhausted
Wired but tired
Fine initially… then crash later
🔄 Cortisol vs Adenosine: The Push–Pull
Adenosine slows us down.
Cortisol wakes us up.
Cortisol naturally rises in the morning — that’s normal.
That’s why cortisol is typically tested between 7–8am.
When caffeine is added on top of that morning cortisol rise:
Adenosine is blocked
Cortisol is stimulated
For some people, this feels like clean energy.
For others — especially in midlife — it feels like anxiety, jitters, or overstimulation.
The difference usually isn’t the coffee.
It’s what the nervous system was already dealing with before the coffee arrived.
☕ Why Coffee Tolerance Builds
When adenosine receptors are blocked repeatedly, the brain adapts.
It simply says:
“If these receptors keep getting blocked, we’ll make more of them.”
So over time:
The same coffee stops working
You need more to feel the same effect
Skipping coffee feels awful
Nothing is broken.
This is normal neurological adaptation.
🚫 What Happens If You Suddenly Quit Coffee
If you stop caffeine after years (or decades) of use:
All those extra adenosine receptors are suddenly available
Adenosine floods the system
This is why people feel:
Heavy
Foggy
Achey
Like they’ve been hit by a truck
This phase does pass, but in midlife it often takes longer than expected.
🦋 Thyroid Medication & Coffee (Especially T3)
This is why thyroid meds are advised to be taken away from coffee:
Absorption
Coffee reduces thyroid hormone absorption in the gut — especially T3.
Stacked stimulation
Thyroid hormone already speeds things up.
Coffee blocks adenosine and pushes cortisol.
Together, this can feel like:
Wired mornings
Anxiety
Shakiness
Big afternoon crashes
Many women become more sensitive to thyroid medication in midlife, even if they’ve taken it for years.
If that sounds familiar, it’s worth exploring.
☕ Why People Respond So Differently to Coffee
Some people feel nothing at all → long-term tolerance
Some can’t tolerate even a sip → high stress load, already elevated cortisol
Some can drink coffee before bed → but sleep quality is still affected
Coffee isn’t about stimulation.
It’s about how the brain manages adenosine — and how that interacts with cortisol and thyroid.
🎯 Final Thought
Coffee works by blocking adenosine.
Adenosine is what naturally calms us and winds the day down.
When that balance is disrupted — especially in midlife — we don’t get a smooth landing.
We get wired mornings… and hard crashes later.
🔜 Coming Up Next
Next episode: Food sensitivities and how they change in midlife
🎄 If you celebrate Christmas, I wish you a wonderful one.
✨ And every joy, every blessing, and great health moving into 2026.
— Joanne
View all episodes
By joanne lee cornish☕ Adenosine, Coffee & Why Tiredness Is Supposed to Happen
Midlife Mayhem Podcast
It’s Christmas week 🎄 and just a few weeks until my programs begin for the new year.
If you’d like to see my full 2026 schedule, you’ll find it at:
👉 www.JoanneLee2026.com
🚀 Programs Starting Soon
5-Day Peak Shred
📅 January 12–18
A powerful 5-day reset with:
Coaching calls
Structure
Momentum
Yes, weight loss — but so much more than that
January is the only time this program is running early in the year.
👉 www.5DayShred.com
🎟 10% off if you join before Jan 1
Use code: PEAK
Victory Vault
📅 Starts January 26 | Runs for 2 weeks
A once-a-year program focused on:
Identity
Standards
Discipline
Who you need to be to achieve what you want
This is not goal-setting.
This is doing the internal work that makes goals inevitable.
👉 www.YourVictoryVault.com
The Perfect 10 (Applications Open)
🗓 Starts March 1
A 10-month immersive coaching experience for 10 women who want:
High-level coaching
Long-term consistency
Deep, aggressive support
If you’re interested, email me to discuss fit and details.
🎙 Episode Topic: Adenosine, Coffee & Energy in Midlife
This episode came about very organically — a stale cup of coffee on my desk and a realization that I haven’t really talked about adenosine, and you cannot talk about coffee without talking about adenosine.
So today we’re winging it — and breaking this down in a way that actually makes sense.
😴 Why We Naturally Get Tired as the Day Goes On
Adenosine is the system that controls natural tiredness.
It builds up in the brain the longer we’re awake.
Not because the body releases it intentionally — but because it’s a by-product of energy use.
Every time your brain works, thinks, focuses, or stays alert, it burns energy.
That energy currency is called ATP (adenosine triphosphate).
As ATP is used, adenosine accumulates.
As adenosine builds up, it attaches to receptors in the brain — and once enough of those receptors are occupied, the message is clear:
It’s time to slow down.
That heavy-eyed feeling in the evening?
That drop in motivation?
That “I just can’t do one more thing” sensation?
That’s not weakness.
That’s adenosine doing its job.
⚡ How Coffee Actually Works (and What It Doesn’t Do)
Caffeine does not give you energy.
It does not fix fatigue.
What caffeine does is block adenosine receptors.
Adenosine is still present — but it can’t attach.
So the brain doesn’t receive the tiredness signal.
You don’t suddenly have more energy.
You’ve just silenced the message that says you’re running low.
That’s why coffee can make you feel:
Alert and exhausted
Wired but tired
Fine initially… then crash later
🔄 Cortisol vs Adenosine: The Push–Pull
Adenosine slows us down.
Cortisol wakes us up.
Cortisol naturally rises in the morning — that’s normal.
That’s why cortisol is typically tested between 7–8am.
When caffeine is added on top of that morning cortisol rise:
Adenosine is blocked
Cortisol is stimulated
For some people, this feels like clean energy.
For others — especially in midlife — it feels like anxiety, jitters, or overstimulation.
The difference usually isn’t the coffee.
It’s what the nervous system was already dealing with before the coffee arrived.
☕ Why Coffee Tolerance Builds
When adenosine receptors are blocked repeatedly, the brain adapts.
It simply says:
“If these receptors keep getting blocked, we’ll make more of them.”
So over time:
The same coffee stops working
You need more to feel the same effect
Skipping coffee feels awful
Nothing is broken.
This is normal neurological adaptation.
🚫 What Happens If You Suddenly Quit Coffee
If you stop caffeine after years (or decades) of use:
All those extra adenosine receptors are suddenly available
Adenosine floods the system
This is why people feel:
Heavy
Foggy
Achey
Like they’ve been hit by a truck
This phase does pass, but in midlife it often takes longer than expected.
🦋 Thyroid Medication & Coffee (Especially T3)
This is why thyroid meds are advised to be taken away from coffee:
Absorption
Coffee reduces thyroid hormone absorption in the gut — especially T3.
Stacked stimulation
Thyroid hormone already speeds things up.
Coffee blocks adenosine and pushes cortisol.
Together, this can feel like:
Wired mornings
Anxiety
Shakiness
Big afternoon crashes
Many women become more sensitive to thyroid medication in midlife, even if they’ve taken it for years.
If that sounds familiar, it’s worth exploring.
☕ Why People Respond So Differently to Coffee
Some people feel nothing at all → long-term tolerance
Some can’t tolerate even a sip → high stress load, already elevated cortisol
Some can drink coffee before bed → but sleep quality is still affected
Coffee isn’t about stimulation.
It’s about how the brain manages adenosine — and how that interacts with cortisol and thyroid.
🎯 Final Thought
Coffee works by blocking adenosine.
Adenosine is what naturally calms us and winds the day down.
When that balance is disrupted — especially in midlife — we don’t get a smooth landing.
We get wired mornings… and hard crashes later.
🔜 Coming Up Next
Next episode: Food sensitivities and how they change in midlife
🎄 If you celebrate Christmas, I wish you a wonderful one.
✨ And every joy, every blessing, and great health moving into 2026.
— Joanne