That might be the purpose of becoming a deathfat: Losing the abilities of higher reasoning and self awareness.
If there wasn't a purpose to it, it wouldn't be a thing, right?
I don't think it is a
purpose, but I do think that it is a
result of their gluttony-oriented existence and not necessarily the
cause of it (although it might be in some cases, but not Chantal's)
I have long suspected and postulated here that she suffers from (perhaps profound) neocortex damage.
The neocortex is what sets mammals apart from reptiles. Reptiles don't have them, but mammals do (hence, the
neo- prefix, it is a "new" part of the brain).
The neocortex is responsible for the following:
Language processing (she struggles understanding what she reads and has trouble expressing thoughts and ideas in words)
Sensory perception (she isn't known for being very perceptive in terms of taste, touch, smell)
Spatial reasoning (she is clumsy as all hell and poor at applying symmetry to anything)
Conscious thought (she has very few that aren't reptilian concerns like eating)
Generating motor commands (clumsy again)
Episodic memory (she never seems to remember anything the way it happened, when it happened, how it happened, or why it happened)
Social and emotional processing (she is incapable of cooperating with other humans, and her emotions are frequently inappropriate to the situation)
Sleep, memory, and learning processes (she complains of irregular sleep and she has never learned a fucking thing in her life)
Nurturing and mothering (she hates kids and knows little to nothing about nurturing or mothering anything, even her cats)
Self-regulation of behavior (fuggedaboudit; she has zero)
Insight and forethought (she has none)
Spiritual awareness (she has none)
Self-awareness and embarrassment (she has none)
It also is responsible for critical reasoning, particularly divergent thinking (the ability to generate original, new ideas) and convergent thinking (the ability to evaluate a number of potential solutions to find the optimal one). In these regards, she is legit retarded in the classic sense of the word. She can do neither at all. Dogs and cats have better convergent thinking, and I'm not kidding. This is why she cycles and reliably makes the worst possible choices for herself.
In simpler terms, she has fucking eaten her way into actual brain damage, which is quite a feat. You see it in other deathfatties too, but Chantal takes it to undreamt-of extremes (as she does everything)
You can damage the neocortex by getting whacked on the head or through heavy drug use. Some diseases will attack it. But I suspect (and I emphasize I am no doc), it is something you can damage simply through sloth, gluttony, and willful ignorance. I may be wrong, but I am gonna believe it until I see it disproven...