title_body: Decreased blood acidity
upvoted_answer: Our blood ph level drives our respiratory rate, if we are not breathing out enough CO2 we build up carbonic acid which in turn drives our respiratory rate higher until such time we have reduced our PH levels to a 'normal' range which is around 7.35 to 7.45 Ph.
   Simply put it's not possible to alter blood acidity or alkalinity without making yourself sick and usually ending up in an ICU.
  The human body (and other species) uses a process called homeostasis which is our autopilot of systems integration to keep us alive and relatively healthy. Illness and chronic disease can impact on our bodies ability to balance itself but it will do it's best to keep its chemistry balanced.
  There are a number of cases (Illness) where php drops (acidity) and the body moves other chemicals around to balance this which can have a knock on effect throwing other systems out (I.e. cardiac arrhythmias due to sodium/ potassium  / calcium imbalances etc.). There are other cases where calcium.is scavenged from our skeletal system (which can cause early onset osteoporosis, and a cohort of other nasties.
  
  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5118493/
  
  I studied medicine and am a registered Paramedic and a massive consumer of fresh ground black coffee.
  Hope this helps....