Prática de Shadowing: 2-Minute Neuroscience: Leptin & Ghrelin - Aprenda a falar inglês com vídeo

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Leptin and ghrelin are two hormones that exert opposing influences in the regulation of appetite and energy balance.
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Leptin is produced mainly by fat cells, and circulating leptin levels increase as body fat increases, reflecting the amount of stored energy in the body.
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Leptin acts on receptors in several brain regions,
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most notably the hypothalamus, where it suppresses food intake by inhibiting appetite -stimulating neurons and activating neurons that reduce feeding behavior.
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Ghrelin is produced mainly by the stomach, and is released when energy availability is low, such as during a period of fasting.
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Ghrelin levels typically rise before meals and fall after eating, and thus may play an important role as a short -term driver of hunger and feeding.
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Ghrelin also exerts many of its effects through receptors in the hypothalamus, where it activates neurons that promote feeding behavior.
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Ghrelin may also influence the reward system, which could increase food intake for the sake of pleasure, independent of energy availability.
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In general, leptin inhibits hunger and ghrelin stimulates it,
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and the balance between the two forms part of a broader system that helps regulate feeding behavior and body weight.
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When we lose weight, for example, ghrelin levels tend to increase and leptin decreases,
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mechanisms that are thought to help us maintain a consistent weight over time.
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The role of leptin and ghrelin in obesity, however, is still unclear.
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Leptin levels in obesity are higher than normal, but the brain is often less responsive to leptin, a phenomenon called leptin resistance.
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Ghrelin levels are typically lower in people with obesity, and do not fall as significantly after a meal, nor rise as much before a meal.
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It's possible these more stable ghrelin levels could result in less restricted eating periods and contribute to obesity, but more research is needed to confirm this.

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Vocabulário e dicas de fala para esta lição

Esta aula de conversação usa o vídeo “2-Minute Neuroscience: Leptin & Ghrelin”. As palavras que mais se repetem: ghrelin, leptin, levels, obesity, feeding. Este vídeo tem 16 frases e 302 palavras para praticar shadowing. A fala dura 1:50. O falante fala em ritmo natural, cerca de 165 palavras por minuto, próximo de uma conversa do dia a dia. Apenas 71% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.

Vocabulário principal deste vídeo

15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:

PalavraPronúnciaSignificado
obesity substantivo/ə(ʊ)ˈbiːsɪti/obesidade
meal substantivo/ˈmiːl/refeição
availability substantivo/əˌveɪ.ləˈbɪl.ɪ.ti/disponibilidade
hunger substantivo/ˈhʌŋɡɚ/fome
appetite substantivo/ˈæp.əˌtaɪt/apetite
receptor substantivo/ɹɪˈsɛp.tə/receptor
activate verbo/ˈæktɪˌveɪt/ativar
stimulate verbo/ˈstɪm.jəˌleɪt/estimular, incentivar
consistent adjetivo/kənˈsɪs.tənt/consistente
stable substantivo/ˈsteɪ.bəl/estábulo, cavalariça
stomach substantivo/ˈstʌmək/estômago
confirm verbo/kənˈfɝm/firmar
sake substantivo/ˈseɪ̯k/causa, interesse
reflect verbo/ɹɪˈflɛkt/refletir
regulation substantivo/ˌɹɛɡjʊˈleɪʃən/regulamento

Gramática neste vídeo

As estruturas que o falante mais usa, com as palavras exatas do vídeo:

EstruturaNo vídeo
Voz passiva be + particípio passado — o foco está no que acontece, não em quem fazis produced · are thought · is needed

Pronúncia para ficar de olho

  • Palavras longas — acerte a sílaba tônica: obesity /ə(ʊ)ˈbiːsɪti/, availability /əˌveɪ.ləˈbɪl.ɪ.ti/, regulation /ˌɹɛɡjʊˈleɪʃən/, mechanism /ˈmɛk.ə.nɪ.zəm/, phenomenon /fəˈnɒm.ɪ.nən/

Sons difíceis para falantes de português:

  • Consoante final — sem acrescentar um “i” depois: intake /ˈɪnteɪk/, appetite /ˈæp.əˌtaɪt/, activate /ˈæktɪˌveɪt/, stimulate /ˈstɪm.jəˌleɪt/, consistent /kənˈsɪs.tənt/
  • /l/ final — a língua toca o céu da boca, não vira “u”: meal /ˈmiːl/, stable /ˈsteɪ.bəl/
  • /h/ — um sopro suave, diferente do “r”: hunger /ˈhʌŋɡɚ/, hormone /ˈhoɹmoʊn/, inhibit /ɪnˈhɪbɪt/

Como praticar com este vídeo

  1. Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
  2. Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
  3. Grave a sua voz e compare com o original, prestando atenção a palavras como obesity, meal, availability.

O que é a Técnica de Shadowing?

Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.

Técnica de shadowing: leia o guia completo passo a passo →