Which Intentional
Actions = Kamma influence Health?
A student once asked the Buddha:
Master Gotama, what is the cause and condition why some human beings are healthy,
while other human beings are often sick?
The Blessed Buddha then explained:
Here, friend, some man or woman is in the habit of injuring living beings
with the hand,
with a stone, with a stick, with another instrument, with a
weapon, or with a knife!
Because of intending and performing such
evil action, at the breakup of
the body,
right after death, such one is reborn in a state of affliction, in a painful destination,
in the purgatory, or even in one of the hells... But if such one at the
breakup of the body,
right after the death-moment, is not reborn in an awful state,
in a painful destination,
in the purgatory, or in the hells, but instead comes back to this human state, then wherever
such one is reborn such one is weak, feeble, fragile, unhealthy,
unwell, and often sick!
These are the actions, friend, leading to future disease: Injuring living
beings with the hand,
with a stone, with a stick, with another instrument, with a
weapon, or with a knife!
However, friend, any man or woman, who
fully avoids injuring any living being with the hand,
with a stone, with a stick, with another instrument, with a
weapon, or with a knife because
of intending and fully perform only such good and harmless action, at breakup of the body,
right after
the death moment, such one reappears in a pleasurable and happy destination,
even in the divine dimensions! But if at the breakup of the body, right after
death, such one
is not reborn in a happy destination, in the heavenly worlds, but instead comes back to any
human state, then wherever such one reappears, such one is
strong, vigorous and healthy!
This is the way, friend, leading to health, to be exact: Avoiding all injuring,
wounding and
harming of any sentient living being, whether with the hand,
with a stone, a stick, or with
any instrument, knife or weapon...

For details on the mechanics
of Kamma = Intentional Action see:
https://What-Buddha-Said.net/drops/II/Kamma_is_intention.htm
https://What-Buddha-Said.net/drops/II/Buddha_on_Kamma.htm
https://What-Buddha-Said.net/drops/II/Good_Action_dilutes_Evil_Kamma.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_short_vs_long_life.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Health_vs_Sickness.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Low_or_High_Birth.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Wealth_or_Poverty.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Beauty_vs_Ugliness.htm
https://What-Buddha-Said.net/drops/II/Effect_of_kammic_Action_is_Delayed.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Power_or_Disrespect.htm
https://What-Buddha-Said.net/drops/II/Evil_Kamma_enhances_other_Evil_Kamma.htm
https://What-Buddha-Said.net/drops/II/Good_Action_enhances_other_Good_Kamma.htm
https://What-Buddha-Said.net/drops/II/Kamma_leading_to_Stupidity_or_Intelligence.htm
Source:
The Moderate speeches of the
Buddha: The short speech on Action. MN 135
http://store.pariyatti.org/Middle-Length-Discourses-of-the-Buddha_p_1543.html Full Text:
http://www.accesstoinsight.org/tipitaka/mn/mn.135.nymo.html