# Why does caffeine have no effect on me?

**URL:** <https://boards.straightdope.com/t/why-does-caffeine-have-no-effect-on-me/839149>\
**Category:** In My Humble Opinion\
**Created:** [August 24, 2019, 7:59am UTC](https://boards.straightdope.com/t/why-does-caffeine-have-no-effect-on-me/839149 "2019-08-24T07:59:11Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![panache45](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/panache45/32/64_2.png) [@panache45](https://boards.straightdope.com/u/panache45)\
**Post date:** [August 24, 2019, 7:59am UTC](https://boards.straightdope.com/t/why-does-caffeine-have-no-effect-on-me/839149/1 "2019-08-24T07:59:11Z")

</div>

I can drink three mugs of very strong coffee… and then go to sleep. It doesn’t keep me awake or make me jittery. The only effect I’ve ever felt was when I hadn’t had any for a few years. The first cup kinda perked me up. But after that, nothing. And the caffeine in some soda has the same non-effect.

I do have intense insomnia. But that’s a constant, with or without caffeine.

---

<div class="post-metadata">

**Author:** ![ASL\_v2.0](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/asl_v2.0/32/3525_2.png) [@ASL\_v2.0](https://boards.straightdope.com/u/ASL_v2.0)\
**Post date:** [August 24, 2019, 8:11am UTC](https://boards.straightdope.com/t/why-does-caffeine-have-no-effect-on-me/839149/2 "2019-08-24T08:11:24Z")

</div>

It’s just after 3AM and I’m right there with you. Maybe we just have superior genes that on the one hand make us immune to caffeine’s deleterious effects, and on the other provide us with the stamina to stay up all night?

I think I’ll have another Coke Zero while I ponder that one…