My metabolism is funky. If I lump around all day I'm usually at the low end of this scale, but start doing some cardio and I leap into the ideal zone.
Case in point, last week I was traveling so I got no real walking or biking in for a full week. First day back I get a good walk and bike ride in and immediately back to the good zone. No transition just an immediate leap back to where I should be
On the upside my metabolism will automatically reduce to asking for a less than normal adult amount of calories when not exercising then start demanding a normal amount of calories once any exercise enters my routine, so I am constantly very skinny no matter what I eat
If any form of your shit regularly includes blood, also maybe consult your doctor. Might be just hemorrhoids, especially if it's bright red blood, but even those can be treated.
Thanks mate. Best shitpost.