Hi Karen. I had never dieted in my life & started a very strict keto diet 3 years ago to lose 20 pounds. My boyfriend & I ate almost solely meat, fish, cheese, eggs, nuts, & fats. Within the 1st few weeks, I was so out of breath upon physical exertion (not at rest), that when we were planting trees on his 2 acre yard on a hot day, I literally couldn’t walk more than 30 feet without stopping for a rest to get my breath. I had to plop down on the lawn to catch my breath. He had zero side-effects, btw. My breathlessness was extremely odd, to say the least, because I’ve always been “athletic” & had been hiking a lot before starting the diet & while I’ve never had excellent lung capacity (even while playing several varsity sports in high school) I’ve never had trouble catching my breath after walking 30 feet !!? I knew it was ketosis because it coincided shortly after the start of my diet & that was the only thing that I had changed in my lifestyle (& it was an extremely strict diet keeping carbs under 20g). After a few weeks, my breath normalized. After 2 years of the diet, I quit keto, but recently resumed a relaxed low-carb diet. This time, I’m not using keto strips & am eating lots of low-starch veggies, so it’s not as strict, however, once again, I’m having shortness of breath every time I go hiking (again- it does not happen at rest). Fortunately, this time the breath shortness isn’t as severe, but then again, neither is my more “relaxed” diet. I think @AtomicSpaceBunny ‘s reply (i.e., “acidic blood”) is the answer: blood carries oxygen, & low pH blood doesn’t carry as much to your lungs & other organs. Good luck with your IBS & in your endeavors!! EDITED TO ADD: when i 1st experienced shortness of breath, I googled “keto acidosis”. The major symptom is rapid breathing & shortness of breath. I went so ketotic, that I think I was in keto acidosis (which isn’t healthy long term & it’s what people with type 1 diabetes sometimes experience).
I exactly have the same experience as OP. I am also underweight.
Thanks for all the comments, I will try the histamine thing and share my response.
Yes, please do!
Hi! Yeah that sounds rather similar to my experience. For me, the VCD is so far my best explanation. I tried the low histamine and acidic blood options and they didn’t make any difference in my case. So, just in my case, I think the VCD makes the most sense. However, I really don’t know why ketosis would cause the onset of that and make it worse. I can only guess. Good luck!!