Eating less protein could slow aging, major review finds

8 hours ago

A major review of over 350 studies suggests eating less protein could slow aging by improving metabolism, reducing inflammation, and activating longevity pathways.
Protein restriction may offer an alternative to calorie restriction, which is difficult to maintain long-term; studies show it can extend lifespan in animals and improve health in humans.
Lower protein intake increases the hormone FGF21, which boosts energy expenditure, regulates blood sugar, and reduces inflammation, potentially promoting longer life.
Excessive intake of specific amino acids like methionine, isoleucine, and valine may activate growth pathways linked to obesity and aging-related diseases.
Protein needs vary by individual; sedentary people may consume more than needed, while athletes and pregnant women require higher amounts—personalized recommendations based on age and activity are advised.

The MAHA initiative, led by US health secretary Robert F. Kennedy Jr., aims to overhaul US health policies on chronic disease, nutrition, and vaccines, with global ripple effects.
The 2025–2030 Dietary Guidelines recommend increased intake of red meat and dairy, raising protein intake to 1.2–1.6 g/kg, but some scientists argue this lacks evidence from a 2025 systematic review.
Ultra-processed foods are linked to higher risks of death and chronic diseases, but not all are equally harmful; some, like bread with preservatives, can be nutritious.

Sedentary individuals exhibit decreased mitochondrial efficiency, dropping by 28-36%, which may precede diseases like cancer and diabetes.
Key proteins for fuel transport, MPC1 and CPT1, are significantly reduced in sedentary muscles, impairing sugar and fat burning.
Sedentary men showed 38% lower VO2max and 60% higher blood lactate levels, indicating poorer cardiovascular and metabolic health.

Cachexia is a cancer-linked syndrome causing reduced appetite, muscle wasting, and fatigue, affecting 50–80% of people with cancer depending on tumor type and stage.
It is more than a quality-of-life issue; it impairs treatment tolerance, increases mortality, and accounts for 20–30% of cancer-associated deaths.
Historically overlooked, cachexia is now recognized as a multi-systemic, whole-body syndrome involving organ crosstalk (e.g., liver, bone, brain) and metabolic dysfunction, not just simple malnutrition.

Inflammation is now understood to be a common factor in many diseases, shifting from traditional disease categorization.
Chronic inflammation is linked to aging and age-related diseases like cancer, cardiovascular disease, and neurodegeneration.
Modern lifestyle factors (diet, inactivity, pollution, stress) may significantly contribute to chronic inflammation.

Vitamin D was once thought to be a miracle cure for many conditions, but large randomized trials show it is not a miracle.
The classical view holds vitamin D as a bone vitamin that regulates calcium absorption; severe deficiency causes rickets.
Correlation studies linked higher vitamin D levels to better health outcomes, but these may be due to confounding and reverse causation.

The MAHA initiative, led by US health secretary Robert F. Kennedy Jr., aims to overhaul US health policies on chronic disease, nutrition, and vaccines, with global ripple effects.
The 2025–2030 Dietary Guidelines recommend increased intake of red meat and dairy, raising protein intake to 1.2–1.6 g/kg, but some scientists argue this lacks evidence from a 2025 systematic review.
Ultra-processed foods are linked to higher risks of death and chronic diseases, but not all are equally harmful; some, like bread with preservatives, can be nutritious.

Sedentary individuals exhibit decreased mitochondrial efficiency, dropping by 28-36%, which may precede diseases like cancer and diabetes.
Key proteins for fuel transport, MPC1 and CPT1, are significantly reduced in sedentary muscles, impairing sugar and fat burning.
Sedentary men showed 38% lower VO2max and 60% higher blood lactate levels, indicating poorer cardiovascular and metabolic health.

Cachexia is a cancer-linked syndrome causing reduced appetite, muscle wasting, and fatigue, affecting 50–80% of people with cancer depending on tumor type and stage.
It is more than a quality-of-life issue; it impairs treatment tolerance, increases mortality, and accounts for 20–30% of cancer-associated deaths.
Historically overlooked, cachexia is now recognized as a multi-systemic, whole-body syndrome involving organ crosstalk (e.g., liver, bone, brain) and metabolic dysfunction, not just simple malnutrition.

Inflammation is now understood to be a common factor in many diseases, shifting from traditional disease categorization.
Chronic inflammation is linked to aging and age-related diseases like cancer, cardiovascular disease, and neurodegeneration.
Modern lifestyle factors (diet, inactivity, pollution, stress) may significantly contribute to chronic inflammation.

Vitamin D was once thought to be a miracle cure for many conditions, but large randomized trials show it is not a miracle.
The classical view holds vitamin D as a bone vitamin that regulates calcium absorption; severe deficiency causes rickets.
Correlation studies linked higher vitamin D levels to better health outcomes, but these may be due to confounding and reverse causation.

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