![\"How](\"https:\/\/getindya.com\/wp-content\/uploads\/\u00bfComo-cambia-el-metabolismo-con-la-edad-Ciencia-y-gasto-energetico.jpg\" "\\"\\"")
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In this article, we dive into the scientific evidence to explain what actually happens to metabolism as we age. We will explore which myths need to be left behind and how INDYA\u2019s technology <\/a>can help turn age from an excuse into just another variable to optimize when planning an athlete\u2019s nutrition. <\/p>\n\n Metabolism includes all the biochemical processes the body carries out to stay alive, such as maintaining body temperature, keeping the heart and lungs functioning, and repairing tissues. <\/p>\n\n To understand how metabolism changes, we first need to define a few basic concepts. One of the most important is total energy expenditure (TEE), which consists of three main components: <\/p>\n\n TEE = BMR + TEF + physical activity energy expenditure<\/p>\n\n <\/p>\n\n If you have not read the work of Pontzer and colleagues, you should. Their 2021 study published in Science<\/a> analyzed the energy expenditure of more than 6,400 people using the doubly labeled water method\u2014the gold standard in this field. The science tells us that metabolism is remarkably stable between ages 20 and 60. This suggests that the perceived \u201cslowdown\u201d before age 60 is not caused by age itself. Instead, it is usually the combined result of sarcopenia\u2014the loss of metabolically active tissue\u2014and a significant reduction in NEAT. <\/p>\n\n What does this mean for everyday nutrition practice? When a 45-year-old athlete says they are gaining weight \u201cbecause of their age,\u201d something else is usually happening. <\/p>\n\n Communicating this can be a powerful tool for change. It helps clients move away from resignation and toward action. Age is not necessarily the problem; context is\u2014and context can be modified through effective planning and the right technology. <\/p>\n\n If cellular biology remains relatively stable until age 60, why does a \u201cslow metabolism\u201d feel so real to many clients? The answer is not found on their birth certificate. It lies in critical variables that can often be managed, monitored, and modified. <\/p>\n\n Muscles and internal organs\u2014including the heart, liver, kidneys, and brain\u2014are among the body\u2019s most energy-demanding tissues, even at rest. Their metabolic rates can range from approximately 200 to 440 kcal\/kg\/day. This brings us back to the fourth metabolic stage: older adulthood, beginning at around age 60. <\/p>\n\n This change, combined with the loss of functional cell mass, helps explain the genuine annual decline of approximately 0.7% in basal energy expenditure. This factor is directly related to lifestyle, making it highly modifiable. Walking less, spending more time sitting, or lowering training intensity reduces physical activity expenditure and NEAT, causing total daily energy expenditure to fall. <\/p>\n\n A sedentary person will have a \u201cslower\u201d metabolism than a more active individual. Similarly, a 50-year-old client may blame their age when their NEAT has actually fallen by 40% compared with their younger years because of work responsibilities or changes in training, habits, and daily routines. <\/p>\n\n Adipose tissue uses very little energy compared with muscle. Muscle mass consumes approximately 13 kcal\/kg\/day, while adipose tissue uses around 4.5 kcal\/kg\/day. As we age, the hormonal environment that regulates energy use changes, affecting how quickly cells operate. The annual 0.7% decline after age 60 already includes this hormonal shift. These are not separate effects that should be added together; reduced endocrine signaling is one of the reasons organs and tissues become less metabolically active. <\/p>\n\n A client\u2019s dieting history may also lead to downward metabolic adaptations. Severe, prolonged calorie restriction can trigger adaptive thermogenesis. In an attempt to survive, the body optimizes mitochondrial efficiency and learns to produce the same amount of ATP using less substrate. <\/p>\n\n This increased mitochondrial efficiency, combined with the loss of lean mass that often occurs during poorly planned weight-loss programs, can reduce BMR below what would be predicted from body composition alone. If you are a woman, or work with women in clinical practice, Pontzer\u2019s relatively flat metabolic curve up to age 60 may raise questions. \u201cThere is no way my metabolism is the same at 50 as it was at 25.\u201d The important nuance for nutrition professionals is that female metabolism does not simply slow down with age. Instead, the way the body manages energy undergoes significant changes. It is not merely about getting older; it is about how the individual components of the system change. <\/p>\n\n Yes. Basal metabolic rate increases significantly during pregnancy. Fetal growth, placental development, increased blood volume, and the greater demands placed on the heart and lungs all increase daily energy expenditure. <\/p>\n\n The key is understanding the cause of this change. It is not that maternal cells suddenly begin working faster. Rather, there is more metabolically active tissue operating at full capacity. <\/p>\n\n Pontzer\u2019s study showed that when energy expenditure is adjusted for fat-free mass\u2014including the fetus and placenta\u2014the mother\u2019s cells continue working at approximately the same rate. There is simply another occupant with their own energy requirements. <\/p>\n\n The belief that metabolism suddenly comes to a halt during menopause is one of the biggest barriers encountered in clinical practice. Biology, however, suggests that a reduction in total energy expenditure is usually secondary to three other factors: <\/p>\n\n The nutrition professional\u2019s challenge is not to fight metabolism, but to protect muscle mass and adjust energy availability using tools that support accurate planning, such as INDYA\u2019s nutrition software.<\/a> <\/p>\n\n At this point, it is helpful to distinguish between two concepts:<\/p>\n\n Why does this difference matter? Because many apparent metabolic declines are more closely related to biological condition, muscle preservation, activity levels, existing health conditions, and body fat, than to the number of years a person has lived. <\/p>\n\n Two people who are both chronologically 60 years old can have very different total energy expenditures depending on their biological age. This reinforces the idea that chronological age matters much less than the combined factors defining a person\u2019s biological condition. <\/p>\n\n Remember this: <\/p>\n\n Chronological age is a statistical measurement; biological age is a target for intervention. <\/em><\/p>\n\n Nutrition planning should aim to improve biological age by optimizing body composition and energy availability.<\/p>\n\n To translate the scientific evidence into clinical practice, consider how metabolism might behave in four different situations:<\/p>\n\n This table challenges the slow-metabolism narrative: <\/p>\n\n As nutrition professionals, our goal is to help athletes keep their biological age as low as possible. To prevent downward adaptations in energy expenditure, interventions should focus on several key strategies. <\/p>\n\n Simply meeting the minimum protein requirement may not be enough. In masters athletes, anabolic resistance may require protein intakes of approximately 1.6\u20132.2 g\/kg\/day, with sufficient leucine at each meal to preserve metabolically active tissue. <\/p>\n\n Excessive restriction triggers adaptive thermogenesis. Chronically falling below 30 kcal per kilogram of fat-free mass per day may cause the body to reduce metabolic expenditure. Energy expenditure depends on enzymatic processes in which magnesium, iron, and B vitamins play essential roles. Without these cofactors, mitochondria cannot function efficiently. This can impair energy management and create a genuine feeling of having a slower metabolism. <\/p>\n\n Mechanical stimulus is one of the strongest allies of nutrition intervention. Without strength training, preserving lean mass and maintaining a higher metabolic rate becomes considerably more difficult. <\/p>\n\n What appears to be a slow metabolism is often simply a reduction in daily movement or a change in training habits. Metabolism is not programmed to fail at age 40. The slowdown observed in clinical practice is usually the combined result of muscle loss, physical inactivity, and poorly planned nutrition strategies. <\/p>\n\n As professionals, we need to move beyond generic equations that focus primarily on age. Instead, we should use technology that adjusts energy intake to each athlete\u2019s actual body composition and physiology.1. Breaking Down Total Energy Expenditure (TEE)<\/h2>\n\n
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It can be calculated as follows: <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n![\"How](\"https:\/\/getindya.com\/wp-content\/uploads\/Pila-1-1.gif\" "\\"\\"")
<\/figure>\n\n2. The Four Metabolic Stages of Life<\/h2>\n\n
Its findings force us to reconsider how metabolism is explained in clinical practice. The study showed that metabolic expenditure adjusted for fat-free mass does not decline in a straight line. Instead, it follows four distinct stages: <\/p>\n\n\n
3. What Really Drives Metabolic Changes?<\/h2>\n\n
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When the size of certain organs decreases, which can occur with aging or physical inactivity, the amount of active tissue consuming energy also decreases. <\/p>\n\n
It is not a system failure. It is a reduction in the size and activity of the body\u2019s metabolic core. <\/p>\n\n\n
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In other words, one kilogram of muscle uses roughly three times as much energy as one kilogram of fat. If body fat increases while muscle mass decreases, the body burns fewer calories both at rest and during activity. <\/p>\n\n\n
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Metabolic stress may also increase cortisol and reduce the conversion of T4 into active T3. This reinforces an energy-conserving state that can persist after the diet ends, facilitating weight regain and strengthening the false belief that metabolism has slowed because of age. <\/p>\n\n4. Energy Expenditure in Women<\/h2>\n\n
That concern is understandable. Women experience biological milestones that can profoundly transform the body. <\/p>\n\n4.1 Pregnancy: Does Metabolism Increase?<\/h3>\n\n
4.2 Menopause: Does Metabolism Decrease?<\/h3>\n\n
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5. Chronological Age vs. Biological Age<\/h2>\n\n
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<\/li>\n\n\n\n6. Four Examples of Energy Expenditure<\/h2>\n\n
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\n \n <\/th>\n Age<\/th>\n Muscle mass<\/th>\n Activity (NEAT + exercise)<\/th>\n BMR<\/th>\n TEE<\/th>\n <\/tr>\n <\/thead>\n \n A<\/strong><\/td>\n 30<\/td>\n Average<\/td>\n Moderate<\/td>\n 1600 kcal<\/td>\n 2300 kcal<\/td>\n <\/tr>\n \n B<\/strong><\/td>\n 50<\/td>\n Low<\/td>\n Baja<\/td>\n 1450 kcal<\/td>\n 1900 kcal<\/td>\n <\/tr>\n \n C<\/strong><\/td>\n 50<\/td>\n High<\/td>\n High<\/td>\n 1750 kcal<\/td>\n 2500 kcal<\/td>\n <\/tr>\n \n D<\/strong><\/td>\n 70<\/td>\n Average<\/td>\n Moderate<\/td>\n 1550 kcal<\/td>\n 2000 kcal<\/td>\n <\/tr>\n <\/tbody>\n<\/table>\n\n \n
7. Final Recommendations and Intervention Strategies<\/h2>\n\n
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To protect basal metabolic rate and thyroid function\u2014particularly free T3\u2014technology can help nutrition professionals implement appropriate nutrition periodization. This may involve alternating deficit periods with higher-energy phases that signal to the body that it does not need to enter an energy-conservation state. <\/p>\n\n\n
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Fortunately, INDYA\u2019s software<\/a> allows athletes to update their daily activity and workouts and synchronize devices such as Garmin and Apple Watch, as well as apps such as Strava. This provides real-time data on daily energy expenditure, heart rate, and heart rate variability, allowing nutrition plans to be adjusted to the athlete\u2019s current biological reality instead of relying solely on theoretical estimates. <\/p>\n\n
With INDYA, age no longer has to be a limiting factor. Nutrition planning can evolve alongside the athlete\u2019s physiology. <\/p>\n\n\n INDYA \u00b7 Professional Nutrition Software \n <\/h4>\n\n