I am looking for a word that can be used to describe an effort or endeavour that is idealistic to the point of being dangerous and which is unwise to pursue. Perhaps, an example could be when people try to abstain from food for weeks and months in order to obtain a deeper spiritual consciousness but this act rather leads to near-death or emaciation.
The word would be different from quixotic as I believe quixotic represents a level of foolishness. And I want the word to convey danger or immoderation - something which is likely to lead to a collapse.
If this question has been asked before, I apologize!
EDIT: the word that I was thinking of might be used in a situation regardless of the possibility of self-denial. Another example: the word could represent the type of society which emphasizes maximal profits from work or optimal physical health but the pursuit of which would lead to eventual breakdown because people would lose time for other important things in life or become too narrowly focused on being fit.
*EDIT: thank you to all who contributed @davidblomstrom (special mention), @ermanen (great answer), @dcshannon (helpful research), @danbron (great follow-up), @edwin (the first to respond), @wayfaringstranger, @mystisinha, @ws2, @zibbobz, @nicole, @abathur, @peter, @bohica / @doorknob, @armen, @eatoin, @tessellatingheckler, @dafdarf and @eric! Hugs and Peace