It has to do with acetylation, in those with slow acetylation, caffeine will increase blood pressure and heart rate for awhile, and will give you tunnel vision, then a few hours later you are hungry and tingly.  Caffeine effects blood pressure, release of insulin, and releases stress hormones.

I have been caffeine free 4 days now and my resting heart rate is around 60 instead of 90!  

JJR explorers can be any blood type and red meat is not a problem for them, and is actually needed to prevent anemia and provide good long lasting energy with no crash.

Agreed on all accounts.  

I've been caffeine free for over 5 years now.  I'm pretty sure it has helped me a great deal.  I have low blood pressure.  Kind of the opposite affect, but it's better than high, imho.  

and yup congrats ....

Easy E, thanks for reminder on caffeine and sugar release.  

It's funny but I was always sensitive to caffeine....Been drinking one cup of regular coffee at lunchtime
with absolutely no negative effects at all.  So although I was caffeine sensitive most of my life, right
now, I don't seem to be. Of course, I don't think I"ll try drinking regular coffee right before bed, but
it used to be where a morning cup of coffee made me feel shaky.  Now I don't even notice any effects of caffeine at all.  Wonder why this happened.  I don't even get a withdrawal headache if I drink coffee
one day and not the next.

You're probably just more healthy now and able to stand it better.

I read in other places that caffeine is beneficial to health, even if someone is more sensitive to it if they are in good health.  It benefits the liver, the heart, the mind, and the muscles.  Seems like caffeine is a paradoxical substance.

I suppose moderation is the key, and everyone has a different definition of moderation for them when it comes to caffeine.  

Quoted from Easy E

I read in other places that caffeine is beneficial to health, even if someone is more sensitive to it if they are in good health.  It benefits the liver, the heart, the mind, and the muscles.  Seems like caffeine is a paradoxical substance.

I suppose moderation is the key, and everyone has a different definition of moderation for them when it comes to caffeine.  

I do well with it.
I'm grateful for it.

Quoted from Lola

plus mimic an insulin resistance issue

This is interesting. I am going to be honest here... in my younger days, I lived on caffeine pills and diet coke. I truly think that my body was suffering from adrenal fatigue.

I wonder how much caffeine is ok? Isnt there research saying that it does have some positive effects?

please do not judge

Quoted from san j

I do well with it.
I'm grateful for it.

I am with you. I seem to be ok if I have a little caffeine in the am, but after that I feel jittery if I have it in the afternoon.

Quoted from marjorie

I am with you. I seem to be ok if I have a little caffeine in the am, but after that I feel jittery if I have it in the afternoon.

Occasionally now I take a cup of tea at "teatime", too, medicinally, as it were, if I'm fading...

Quoted from marjorie

I am going to be honest here... in my younger days, I lived on caffeine pills and diet coke. I truly think that my body was suffering from adrenal fatigue.

please do not judge

I think we all did things that we didn't know were doing us big hurts before knowing better...      

Anyone who hasn't probably isn't trying to get better...

http://www.ncbi.nlm.nih.gov/pubmed/10419909

Why not? here is a study that shows that gluten sensitivity can increase over time.

Quoted from Andrea AWsec

http://www.ncbi.nlm.nih.gov/pubmed/10419909

Why not? here is a study that shows that gluten sensitivity can increase over time.

Maybe it's me but we're discussing caffeine and I was wondering the relevancy of your link
to a gluten study. Is it related to caffeine

Quoted from Chloe

Maybe it's me but we're discussing caffeine and I was wondering the relevancy of your link
to a gluten study. Is it related to caffeine

I think Andrea's point is, if gluten sensitivity can increase as we get older, it's possibly a common thing for caffeine sensitivity to increase later in life, also.  Maybe not related, but thoughtful ponderings anyway.

Anything can increase over time IMO.

We as individuals increase in time it is called the aging process.

TY Victoria for the clarification, and I do believe Andrea was trying to suggest what you noted above.

I hope my wrinkles decrease as I get older!!!

Allergies too.  It might be that we had a problem with them our whole life, but the symptoms were not that significant as a younger person.  And then later in life, BAM.

I know this, I used to work on cars and love cars and would be around lots of chemicals.  If I did that now, I'd be in trouble.  One summer recently, two guys gave me rides in old cars they were fixing up (2 different situations).  Both of them stunk like either exhaust or something.  I got a sore throat for almost a week after each ride.  It was only a few minute ride.  I don't recall those types of things when I was younger.  

I have lyme disease though, and I think it makes things worse to a degree.  But as we get older, these things can happen.  

That reminds me that those of my age grew up in a culture where it seems the majority of adults smoked. My mother did. Also public buses/trains allowed smoking. I have taken smoky Greyhound buses that some of you younger folks would be disgusted with. Breathing the smoke was considered normal, but I didn't like that it permeated my coat!
All that smoke didn't bother me, but now, even smoke on the clothes of a person can cause me to cough. Certain brands do & others don't. Perfumes bother me, as do other odors, but not all of them. Maybe geting old does that or we are detoxing & react more.

I noticed after getting physically more fit that caffeine effects me far more and in a different way than before i started cycling.  

Before caffeine would rattle me and make me irritable and then my blood sugar would crash.  Yet i would fall asleep rather easy and crash.

Now caffeine does not rattle me really, and my blood sugar does not feel like it crashes, yet if i drink even a tea, much less a coffee, in the afternoon, i will not fall asleep until 2 or 3 am it feels like.  Why this is the case, i cannot really understand.

I thought the cycling was causing me to not sleep, but now when i get to ride my bike, i knock out after a good ride.  In fact it was a different reaction to caffeine (probably my liver being cleaner) causing it.  

My wife says it is because i am in my 30's now, but i do not believe that!  I think it is because my system is cleaner and works better now.  

My energy levels are far better now when i can ride on days i do not work my 12 hour shifts, i feel calmer with a stable mood, and caffeine seems to effect me in a very different way now.  If i drink a coffee, it has to be first thing in the am for it to burn off during the day so i can sleep before 2 am!.  

I also started using milk thistle again, which seems to help with toxins, perfumes, esp house cleaners, smoke and exhuast, etc. as does being in better shape.

Quoted from Victoria

I think Andrea's point is, if gluten sensitivity can increase as we get older, it's possibly a common thing for caffeine sensitivity to increase later in life, also.  Maybe not related, but thoughtful ponderings anyway.

Yup look deeper at things and you will be surprised what you can find.
  So to me it is quite relevant to discuss any sensitivity in the body can increase or appear over time.

Often our bodies have had enough-- mine just recently decided it would give me eczema. I am 49 years old never had it in my life eat a great diet and here it is rearing its ugly head all over my neck.

Thanks for Dr. D is all I can say.

Quoted from Andrea AWsec

Yup look deeper at things and you will be surprised what you can find.
  So to me it is quite relevant to discuss any sensitivity in the body can increase or appear over time.

Often our bodies have had enough-- mine just recently decided it would give me eczema. I am 49 years old never had it in my life eat a great diet and here it is rearing its ugly head all over my neck.

Thanks for Dr. D is all I can say.

Even with a nearly perfect diet, stress can trigger all kinds of strange outbursts on and in our bodies.  It's easy to forget this because we are so used to being responsible, productive, helpful, supportive, etc . . to other people. Sometimes our own dear bodies are telling us that the stress is over the top.