How long does caffeine really stay in your system?

How long does caffeine really stay in your system?

Author: QuickAndDirtyTips.com, Monica Reinagel November 26, 2025 Duration: 11:29

There’s definitely a lot of individual variation. But knowing the half-life of caffeine is useful…especially if you actually understand what the half-life of a substance actually means.

Related episodes:

#620: Is coffee good or bad for you?

#414 What is brewed cacao?

#361: How to find coffee that won’t bother your stomach

Find a transcript here

New to Nutrition Diva? Check out our special Spotify playlist for a collection of the best episodes curated by our team and Monica herself! 

We've also curated some great playlists on specific episode topics including Staying Strong as We Age, Diabetes, Weight Loss That Lasts and Gut Health! Also, find a playlist of our bone health series, Stronger Bones at Every Age

Have a nutrition question? Send an email to nutrition@quickanddirtytips.com.

Follow Nutrition Diva on Facebook and subscribe to the newsletter for more diet and nutrition tips. 

Find out about Monica's keynotes and other programs at WellnessWorksHere.com

Nutrition Diva is a part of the Quick and Dirty Tips podcast network.  


Hosted on Acast. See acast.com/privacy for more information.


You're probably tired of the constant noise around what to eat, with every headline seeming to contradict the last. Nutrition Diva cuts through that confusion. Hosted by Monica Reinagel, a seasoned expert from QuickAndDirtyTips.com, this weekly conversation feels like getting clear, practical advice from a trusted friend who actually understands the science. Instead of pushing fads, Monica takes the latest nutrition research and unpacks it in a way that makes sense for real life, separating the solid findings from the hype. She directly tackles the questions that pop up in your own kitchen, whether you're wondering about a new superfood or just trying to pack a better lunch. The goal isn't perfection, but building a sensible, sustainable approach to food that leaves you feeling informed and in control. Tuning into this podcast means replacing anxiety with actionable knowledge, so you can make choices that are right for you without the dogma. It's a grounded resource for anyone who wants to think about health and eating well, but could do without the extreme diets and scare tactics.
Author: Language: English Episodes: 832

Nutrition Diva
Podcast Episodes
How Much Water Do You Really Need To Drink? [not-audio_url] [/not-audio_url]

Duration: 9:37
Staying hydrated is obviously important. But you may be surprised to find out how much water it takes.A transcript is available at Simplecast.com.Check out all the Quick and Dirty Tips shows.Subscribe to the newsletter f…
The Big 8—Should You Avoid These Common Food Allergens? [not-audio_url] [/not-audio_url]

Duration: 7:03
Is there any reason to avoid foods that are common allergens even if you're not allergic to them? Just how common are the most common food allergies?Read the transcript.Check out all the Quick and Dirty Tips shows.Subscr…
The Candida Diet: Separating Fact from Fiction [not-audio_url] [/not-audio_url]

Duration: 9:10
You'll find a confusing mix of true and false information about candida diet and nutrition online. Let’s sort fact from fiction.Read the transcript on Quick and Dirty Tips.Check out all the Quick and Dirty Tips shows.Sub…
Does Insulin Resistance Lead to Binge Eating? [not-audio_url] [/not-audio_url]

Duration: 9:26
Does insulin resistance lead to binge eating or is it the other way around? Nutrition Diva looks into what researchers have found about Binge Eating Disorder and insulin resistance.Read the transcript on Quick and Dirty…
The Best Foods for Healthy Skin [not-audio_url] [/not-audio_url]

Duration: 10:06
Can collagen supplements reduce wrinkles? How does the microbiome affect the skin? Find out what to eat to keep your skin looking its best.Read the transcript on Simplecast New to Nutrition Diva? Check out our special Sp…
Can These Snack Bars Replace Your Cholesterol Meds? [not-audio_url] [/not-audio_url]

Duration: 8:33
Some new "functional food" products offer an alternative for those who can't or won't take medication to control cholesterol. What's in these products and what's the evidence to support the claims?Read the transcript on…
Counting Calories: the 4-4-9 Myth [not-audio_url] [/not-audio_url]

Duration: 7:47
The calorie counts on many low-carb foods appear to vastly understate the actual calorie count. Are you actually eating more calories than you think?Read the transcript on Quick and Dirty Tips.Check out all the Quick and…
The Latest Research on Auto-Immune Disease and Vitamin D [not-audio_url] [/not-audio_url]

Duration: 11:09
New research suggests that regular Vitamin D supplements lower the risk of auto-immune disease in older people. Should you start taking it?Read the transcript on Quick and Dirty Tips.Check out all the Quick and Dirty Tip…
What to Do When Medications Cause Weight Gain [not-audio_url] [/not-audio_url]

Duration: 15:18
1 in 5 Americans takes a prescription medication that can cause weight gain as a side effect. What do patients and doctors need to know about obesogenic drugs? Pharmacist and obesity educator Ted Kyle shares his insights…
The Episode You Wrote: Listener Q&A [not-audio_url] [/not-audio_url]

Duration: 15:41
This week, Nutrition Diva answers some of your questions! Can you get vitamin E from lotion? Is rinsing quinoa really necessary? Are sprouts a good source of protein? What are the advantages of organic milk? Is this the…