Browse evidence-based analysis of health-related claims and assertions
Both versions of the ketone body (D and L) relaxed rat heart arteries equally, showing the effect doesn't depend on which version is used.
Descriptive
In rat veins, a ketone body relaxed different veins at different doses, with arm veins relaxing at lower doses than leg or gut veins.
In rat blood vessels, a ketone body relaxed heart, brain, leg, and gut arteries more easily than kidney arteries, with heart arteries responding at lower doses.
In rat heart arteries, a ketone body relaxed the blood vessels starting at low concentrations, with the strongest effect at higher doses.
Quantitative
When added to isolated rat hearts, a ketone body made the heart muscle contract more strongly and increased blood flow to the heart muscle itself.
Causal
In rats, a specific dose of a ketone body made the heart pump more blood per beat and overall without changing how fast the heart beats.
Blood pressure medications are more effective when combined with metabolic improvements (e.g., weight loss, whole-food diet, exercise, sleep) that restore hormonal regulation of sodium and vascular function.
Assertion
Hypertension is primarily caused by processed foods that disrupt multiple regulatory mechanisms of blood pressure, rather than being solely a salt or sugar issue.
Salt restriction effectively lowers blood pressure in young, lean individuals with primary hypertension but has minimal effect in older patients with insulin resistance, obesity, or metabolic syndrome due to hormonal drivers.
Antihypertensive medications reduce blood pressure through specific mechanisms but do not address the underlying metabolic causes of hypertension.
Sleep deprivation increases sympathetic nervous system activity, elevating heart rate and vascular resistance, while restorative sleep enhances parasympathetic activity, reducing cardiac output and vascular resistance.
Dietary fiber reduces postprandial blood glucose spikes by slowing absorption, thereby decreasing insulin secretion and enabling normal renal sodium excretion.
Aerobic exercise induces shear stress on blood vessel walls, stimulating endothelial nitric oxide production, which results in sustained reduction in vascular resistance.
Processed foods are typically low in potassium, which normally aids sodium excretion and vascular relaxation, exacerbating hypertension when combined with high sodium and refined carbs.
Processed foods contain engineered combinations of high sodium and refined carbohydrates, which together cause acute plasma volume expansion and chronic hormonal sodium retention, leading to sustained hypertension.
Chronic insulin resistance impairs endothelial function by reducing nitric oxide production, leading to arterial stiffness and increased vascular resistance.
Insulin resistance results in chronically elevated insulin levels, causing the kidneys to continuously retain sodium due to persistent hormonal signaling.
Elevated uric acid levels directly increase renal sodium reabsorption without insulin involvement.
Fructose metabolism in the liver produces uric acid, which impairs endothelial function by reducing nitric oxide availability and arterial relaxation.
Chronic elevation of insulin activates the sympathetic nervous system, leading to increased heart rate, cardiac output, and peripheral vasoconstriction, thereby raising blood pressure.
Insulin signaling causes the kidneys to retain sodium, independent of dietary sodium intake.
Sodium intake increases plasma volume through osmotic water retention, leading to higher blood pressure due to increased fluid in a closed circulatory system.
People with a condition called primary aldosteronism have 6% more fluid outside their cells than others, but their sodium excretion doesn't affect this fluid level.
People with high blood pressure who aren't taking medication have similar sodium excretion and body fluid levels outside their cells as people with normal blood pressure.