Online nutrition forums often push the theory that artificial sweeteners trigger a "cephalic phase insulin response", the idea that sweet taste receptors on the tongue trick the pancreas into dumping insulin into the blood. Without incoming glucose, the theory goes, blood sugar crashes, inducing ravenous hunger.
Rigorous human metabolic trials demonstrate that this fear is largely unfounded. When ingested in isolation, pure non-nutritive sweeteners do not stimulate human pancreatic beta cells to produce measurable insulin spikes.
Neither Diet Coke nor Coke Zero raises serum glucose. Both beverages pass through initial digestion without the systemic hormonal cascade prompted by liquid sucrose.
Aspartame breaks down in the small intestine into two common amino acids (phenylalanine and aspartic acid) and a trace amount of methanol, all found in far higher quantities in a standard chicken breast or ripe tomato. Ace-K, by contrast, cannot be broken down by human enzymatic pathways. It absorbs into the bloodstream intact and exits through the kidneys within 24 hours without accumulating in tissue. Neither sweetener supplies metabolic substrates for fat storage.
