Physicians describe metabolism as cellular energy rather than weight

The human body functions as a vast network of power plants, and the energy produced by that system dictates how a person thinks, moves, and recovers. Dr. Rhea Rogers, a board certified physician, stated that metabolism is fundamentally about the language of cells and the energy that allows them to operate. She identified mitochondria as the small battery packs that supply this energy to every organ in the body.

Rogers explained that specific organs have higher power requirements than others. The brain and the heart demand substantial amounts of energy to function correctly. When an organ with high energy needs depletes its power supply, symptoms appear more quickly. This dynamic explains why vision and hearing often decline in older adults. These sensory organs require significant power, so their function deteriorates rapidly when cellular energy drops.

When cells fail to produce the necessary energy, individuals often experience cognitive changes. Rogers noted that a lack of cellular energy leads to symptoms such as brain fog, fatigue, and a general sense of being out of it. She emphasized that every physiological process relies on this energy. The heart must beat, the brain must process information, and the immune system must fight infection. All of these functions depend on a steady supply of metabolic energy.

Gerontologist Sam Cradduck compared the metabolic system to a power plant, noting that mitochondria serve as the batteries that keep it running. Cradduck observed that many people view metabolism solely through the lens of weight gain. However, the process also determines how an older person processes medications. Rogers described aging as a progressive loss of cellular energy. This gradual decline in mitochondrial efficiency is the root cause of the symptoms people associate with getting older.

As people age, they often lose muscle mass and gain fat, a condition known as sarcopenia. Rogers pointed out that many hormones lost during aging are directly tied to maintaining muscle. Amy O Rourke, an aging expert, said that people frequently focus on weight loss and overlook the need for strength. She observed that individuals often go on weight loss programs and forget that they need strength. She noted that gaining weight can be a positive sign if it indicates that muscles are getting stronger.

O Rourke recommended strength training two to three times per week for older adults. She advised younger people to start strength training now to avoid a cascading effect later in life. Rogers explained that muscle plays a critical role in how the body uses glucose. Glucose provides energy and must be taken up by muscles to be used. When muscles fail to take in glucose, a condition called insulin resistance develops. This process is where prediabetes and other metabolic issues begin. Rogers stated that building more muscle helps improve this uptake.

Rogers noted that type 2 diabetes is appearing in younger populations. She cited metabolic inflexibility as a contributing factor. This term describes the inability to switch between using fat and carbohydrates for energy. Cells should be able to alternate between these fuel sources efficiently. Rogers said that the body is losing this efficiency due to toxins and inflammation. The inability to switch fuels makes the body less efficient at managing energy resources.

Katherine Ambrose, an aging well coach, said the focus should be on creating health and energy rather than waiting to manage disease. Rogers listed several factors that support metabolic health. These include muscle stimulation, inflammation control, toxin removal, good nutrition, and good sleep. These elements work together to maintain the function of the body's cellular power plants.

The medical experts agree that metabolism is not just about the number on a scale. It is the engine that drives physical strength and daily capability. Maintaining muscle mass and cellular energy is essential for long term function. The body's ability to produce and use energy determines how well a person can live their daily life.