This is a prime example of the alienation and anomie created by capitalism. These men work all day harvesting a plant for a purpose they do not know of. The main interlocutor works with cocoa and knows it is used by wealthy foreign others to make "a good food" that he has never tasted: the others believe it is used to make wine. Their alienation from the product of their labor results in awe when the commodity-fetish object of the chocolate bar is produced almost magically from the reporter's pocket.
The cocoa workers ask the reporter questions like "Is your skin whiter because of the chocolate?" as an attempt to re-frame the interview and negotiate the cultural gulf between them by understanding the reporter's approach, and the connection between their labor and the finished, transformed, standardized and pristine foil-wrapped chocolate bar.
Like them, we must question the intent behind such a pseudo-ethnographic stunt. The report is obviously meant to show a privileged Western audience the deprivation experienced outside their daily milieu. Yet the reporter himself also belies an ethically questionable stance of casual privilege when the reporter, who places himself firmly on the side of "us Westerners" (those who can afford to eat chocolate regularly) in the introduction, demonstrates his privilege by simply pulling out another bar from his pocket after the first bar is gone. By doing so the first bar, shared between many and treated as a unique treat, which it is "a privilege" to taste, is revealed to be interchangeable with all the others, showing the workers the tip of the iceberg of processes by which the unique fruits of each plant, gathered by the labor of unique people, are bought, sold, homogenized, the depth of life and human experience flattened to produce standardized products for consumption by well-fed, wealthy others who never experience the commodity's production or the labor used to produce it.
That is why the workers ask if eating chocolate is why white people are so healthy.
Next, the station showed a bunch of white Dutch people some cacao pods, and they had no idea what they were. However, it's likely they edited out a few Dutchmen who knew their stuff.