Ramadan intermittent fasting does not significantly alter lipid profile parameters—including triglycerides, total cholesterol, LDL, HDL, or non-HDL—in adults with controlled hypertension, despite elevated baseline dyslipidemia in the majority of participants.

When a person fasts for long periods, the body shifts from a stressed state to a calm state, which keeps fat levels in the blood stable even when starting with high levels. This happens because the nervous system slows down the body's fight-or-flight signals and boosts its rest-and-digest signals, preventing the liver from releasing more fat into the blood.