કપાસીએ કોઠા ફાટે નહીં.

kapāsīē kōṭhā phāṭē nahīṁ.

Literally: Stomachs do not burst from cottonseeds.
What it means: Said to point out that poor-quality fare cannot truly nourish or satisfy a person.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.