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> It was eating his lunch, so to speak How does that work. A tapeworm is pretty small relative to your brother (eg by mass), one would think it's caloric needs
by kardos 2y ago
> It was eating his lunch, so to speak
How does that work. A tapeworm is pretty small relative to your brother (eg by mass), one would think it's caloric needs are similarly small and it would just use a small fraction of his food. Can a tapeworm really consume a significant fraction of an adult's food?
- fsckboy 2y agothere are different types of tapeworms that infect different hosts. cattle tapeworms can grow to 12 feet and much more. It doesn't take much googling to find claims of 100 feet. google "tapeworm symptom loss of weight" and you will get the recommendation "time to see a doctor"
- gwern 2y agoSo the explanation would be that growing is just very metabolically expensive and that is where the deficit goes to?
- fsckboy 2y agoI'm no expert on invertebrate metabolism, but it does not need to be more expensive than host metabolism, it's simply a redivision of the pizza-pie with more slices going to the growing worm, and fewer slices for the host.
- fuzztester 2y agoconsider the possibility of there being n worms in the host (person), where n is greater than 1, maybe even significantly greater than 1. so if one worm takes m slices of the pie, and there are n worms in the person, there will be m x n less slices available for the person, which, depending on the values of m and n, could be quite high, and therefore much more detrimental to the person
- fsckboy 2y agoI thought of a refinement to my previous: tapeworms attach themselves to the host intestinal wall only to secure themselves; however, they feed directly from the food in the digestive tract; they do not "suck nutrients" from the host's bloodstream.
- matheusmoreira 2y agoIt's not a tapeworm but here's an example of a parasite that does: https://en.wikipedia.org/wiki/Ancylostoma_duodenale https://en.wikipedia.org/wiki/Ancylostoma_duodenale It's the stuff of nightmares.
- Aurornis 2y agoThat's part of it, but intestinal parasites also interfere with normal digestive processes. Their presence and secretions (waste products and the compounds they use to prevent being digested) can cause a lot of problems. It's common for people with intestinal parasites to have reduced appetite, intestinal inflammation, and digestion issues. The weight loss isn't just a result of the parasite competing for nutrients, though that doesn't help.
- derf_ 2y agoAt the Meguro Parasitological Museum [1], they have an 8 meter long tapeworm [2] extracted from a human. Yes, that is an extreme example and still less mass than a person, but they can get large. [1] https://www.kiseichu.org/e-top https://www.kiseichu.org/e-top [2] Visible in the tall blue case here: https://static.wixstatic.com/media/079dcd_843c7597ef244423aa1a9384adb43559~mv2.jpg/v1/fill/w_309,h_219,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/DSC_1776_JPG.jpg https://static.wixstatic.com/media/079dcd_843c7597ef244423aa...
- Terr_ 2y agoBigger picture of it: https://www.tofugu.com/travel/parasite-museum-tokyo/ https://www.tofugu.com/travel/parasite-museum-tokyo/ The display has a piece of rope, so that you can get a not-too-intimate sense of its length.
- pvaldes 2y agoApart of eating your food directly, anything that can make you bleed internally can cause anemia.