The gut helps make nutrients available by breaking down food and absorbing components the body can use. Those nutrients enter metabolism, where cells release and transfer energy through many interacting chemical steps.
In mitochondria, a proton gradient across the inner membrane helps drive ATP synthase, which produces ATP—the cell’s common energy carrier. This is a simplified view of a complex system; digestion, absorption, metabolism, oxygen delivery and cellular health all play a part.
Food or supplement claims about “boosting cellular energy” should be judged by evidence for the specific claim. Persistent fatigue or digestive symptoms deserve individual assessment.