Fontes de Proteína, Trocas entre Animal e Vegetal, e Saúde a Longo Prazo
A fonte da proteína dietética, e não apenas a quantidade, parece ter consequências significativas para o envelhecimento, a saúde metabólica e o risco de doenças. Da sinalização do IGF-1 à colina derivada de ovos e aos contaminantes em suplementos proteicos, as evidências sugerem que a forma como a proteína é escolhida e preparada importa consideravelmente.
Criado com IAA proteína dietética raramente é discutida com a nuance que merece. A maioria das conversas se concentra em quanto comer, mas um conjunto crescente de evidências sugere que a fonte dessa proteína, sua composição de aminoácidos, a forma como é processada e até como é cozinhada podem ter consequências que vão muito além da massa muscular. Compreender essas distinções pode orientar escolhas alimentares mais precisas, embora a variação individual, as diferenças de qualidade dos alimentos entre regiões e a complexidade das dietas do mundo real signifiquem que nenhuma prescrição única serve para todos.
Criado com IAProteína Animal, IGF-1 e Sinais de Longevidade
Uma das distinções mais relevantes entre a proteína animal e a vegetal está na forma como cada uma afeta as vias de sinalização de crescimento no organismo. Segundo o Dr. Valter Longo, cientista da longevidade da USC, as proteínas animais são mais ricas em leucina, metionina e aminoácidos de cadeia ramificada — os aminoácidos específicos que ativam de forma mais potente o IGF-1 e seu alvo downstream, o mTOR. A elevação crônica do IGF-1 e da atividade do mTOR está associada ao envelhecimento celular acelerado e ao aumento do risco de câncer, segundo Longo, porque essas vias promovem o crescimento celular e suprimem os processos de manutenção celular que protegem a saúde a longo prazo.
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