From struggling to learn Krebs cycle to writing prescriptions

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In school, they told us “biology is fun,” and then handed us the TCA cycle.

We stared at those circles of citrate–isocitrate–α‑ketoglutarate like they were some satanic board game. Add glycolysis, urea cycle, T3/T4 synthesis, CAC, and suddenly half of us were memorising arrows more than actual concepts. Our brains were basically: “I don’t run on ATP, I run on last‑minute panic.”

Fast‑forward to med school: the same cycles are back—but this time as villains in real diseases. Now it’s, “Oh, so that enzyme I hated is the reason this patient is sick.” Somewhere between cursing pyruvate dehydrogenase and prescribing real drugs, you realise something wild.

Those stupid cycles? They were low‑key training montages. We just didn’t know we were becoming the heroes yet.

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What once felt meaningless in textbooks becomes lifesaving in clinics.

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I remember how we used to make mnemonics just to memorise the cycle and then how we always forgot the mnemonic due to an ocean of mnemonics we already had

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We hated those cycles back then, but honestly I used to enjoy memorising them. Now in med school, they finally make sense in real diseases—turns out it was all training.

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These cycles are fascinating to me and reason to land in med school, got selected because of chemistry

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