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Dado el título y el resumen de un artículo a continuación, genere un artículo breve o el comienzo de un artículo largo para acompañarlos. 
Título: Cómo envejece el sistema inmunitario y qué puedes hacer para ralentizar este proceso.
Resumen: El sistema inmunitario es el arma principal de nuestro cuerpo a la hora defenderse del SARS-CoV-2, ha cobrado un protagonismo inesperado en medio de la pandemia de coronavirus.
Artículo: Máximo 500 caracteres. <end_of_turn>
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Article:

The immune system, that complex network of cells, tissues and proteins, is essential to protect us from diseases and keep us healthy. As we age, the immune system also goes through a natural aging process, which can affect its effectiveness in fighting infections and diseases.

With the COVID-19 pandemic constantly reminding us of the importance of a strong immune system, it is vital to understand how it evolves over time and what steps we can take to slow its decline.

As we age, the immune system undergoes changes known as "immunosenescence." This includes a decrease in the production of new immune cells, as well as a decreased response to antigens and increased chronic inflammation. As a result, older adults may become more susceptible to infections and have a less effective response to vaccines.

However, all is not lost. Although aging is a natural and inevitable process, there are actions we can take to maintain a stronger immune system for longer. Lifestyle plays a crucial role in this aspect.

A balanced diet, rich in vitamins and antioxidants, can help support immune function. Additionally, regular exercise can stimulate the production of immune cells and reduce inflammation. Likewise, avoiding harmful habits such as smoking and excessive alcohol consumption can also help maintain a healthy immune system.

In this article, we will explore in detail how the immune system ages and what concrete measures we can take to strengthen it and slow down its decline process. It's time to value our natural shield against disease and take measures to protect our health as we age.<end_of_turn><eos>