In casual American English, "You shouldn't put your foot in your food" sounds like "yoo SHUU-duhnt PUUT yer FUUT ihn yer FOOD". Several things happen here, and the headline one is the Flap T: the T between vowels turns into a quick D-like flap. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.
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What makes this sentence sound American.
In "shouldn't", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. This is called the Flap T, and it's why Americans sound more relaxed than the textbook. It comes out as SHUU-duhnt.
What's happening in this sentence.
Small tricks that turn a textbook sentence into how an American actually says it.
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Saying a hard "T" in the middle.
In "shouldn't", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.
Releasing the final consonant with a puff of air.
In "food", the "" is not released — the articulators get into position but hold without the burst of air. Air stops but there's no release burst — the articulators hold position.
Inserting a vowel before the syllabic consonant.
In "shouldn't", the short unstressed vowel before "" disappears — the schwa is absorbed and the "" becomes the syllable nucleus on its own. Schwa is absorbed — consonant becomes the syllable nucleus.
Saying the consonants separately.
The "" at the end of "" and the "y" starting "" blend together into "" — natural in casual conversation; in formal or careful speech, the two sounds stay separate. The two sounds merge: T+Y → CH, D+Y → J, S+Y → SH, Z+Y → ZH.