I believe it’s not just a matter of what the cells take, as others have mentioned, but what they produce. I looked into this a while ago because I had the same question, “why couldn’t I just, like, eat a little more food? I could eat a whole baby’s diet worth of extra food, most tumors aren’t *that* big”. But tumors grow in uncoordinated ways and produce waste that your body can’t efficiently remove so they can poison surrounding tissues as well as compete with and crowd out good tissue. sorry I don’t have sources, this is just something I read a long time ago.
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