u cant just decide u want to make a glitch wen it probably wouldnt work and besides if they didnt program that in then it will only make u lose hp u have a better chance of making a potion restore 1 million hp... the game has a set limit of how much hp/mp u gain from foods and food unpalable foods its a negative number so short of gaining the ghoul soul from dos in por and equiping it...
(hacking) its impossible

OMG a Use for the fricken RUSTY FOOD TIN!

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*Full Health in Boss Rush Mode without Wasting the Super Potion*

Go into Buss Rush Mode with a file that DOES NOT have the record player OR ANY RECORDS. After losing some health and some MP, go into the pause menu and go to items. Put the cursor on the Super Tonic. Keep pressing the A button until health is filled. This should also use up the Rusty Food Tin. Then press the B button to go back to the Pause Menu Screen. If you go back to the items section, the Super Potion should still be there.

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Yay. Somewhat of a use for it, although you can still get those orbs after beating a boss in BRM.