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> 1000g (ml)

Water has a density of 1 g/mL, most other fluids we ingest are close, but gallium weighs 5g per milliliter and platinum over 20 g/ml.

In purely mechanical considerations, 1000 ml of platinum would weigh 21.4 kg or almost 50 lbs. I'm not a doctor, but I imagine the stomach is not able to hold that much weight!

There are accounts of people drinking mercury (13.5 g/mL) to feel it sloshing around in their stomach.

Apparently a lethal dose is somewhere around 140g because it reacts with stomach acid to form gallium trichloride which is poisonous:

https://yesdirt.com/is-gallium-toxic/

Some compounds of it may have medical uses, though: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2898053/

That said, people have swallowed even crazier things, like when they used to use mercury (!!!) as a laxative:

https://www.discovermagazine.com/planet-earth/following-lewi...

If it is Platinum you go bankrupt.

But that only affects your body if you're made of money.