What type of leaky gut syndrome as you smell in your dinner from last night in your armpits. Then why do my armpits smell like my meatloaf from last night

The short version: the smell is on your skin, not leaking out of your gut, and nothing in this evidence names a "leaky gut type" that sends dinner to your armpits.

I overstated things last time by implying the armpit-odor literature settles the gut question. It doesn't. What these records do show is that underarm odor is made on the surface: aerobic coryneform bacteria on the skin metabolize sweat and gland secretions into odorous compounds, and people with denser coryneform growth smell stronger [3]. Sweat itself carries fatty acids like palmitic, oleic and linoleic acid, plus squalene and cholesterol, that bacteria then break down [2]. The gland that makes the odorous brew is the apocrine gland, and when it overdoes it the condition is axillary bromhidrosis, a sweat-gland problem [1]. That's the mechanism your meatloaf question is actually about.

A meatloaf contains onion, garlic and spices, and those sulfur and amine compounds can reach sweat and breath through the bloodstream. That's ordinary metabolism, not a leak. The retrieved records do not measure food odors in sweat, so I can't give you a rate or name a study. But the gut permeability records you and I looked at before were Whipple's disease, tropical sprue and a mouse fat-transport study, not everyday digestion, and this search still did not surface any study pairing gut permeability with armpit odor in the same people.

There is no "type of leaky gut" that explains meatloaf armpits. The smell is bacterial, it fades, and it isn't a diagnosis. My call: this is normal skin-bacteria body odor, not a gut leak, and persistent strong odor points to the apocrine glands and skin flora, not your intestine. Confidence: moderate.