填空题 When {{U}} {{U}} 1 {{/U}} {{/U}}have spots, someone will tell them to eat less chocolate. Is there any {{U}} {{U}} 2 {{/U}} {{/U}}in his advice? First, is there any {{U}} {{U}} 3 {{/U}} {{/U}}that people who eat chocolate are more likely to have acne? Second, is there a {{U}} {{U}} 4 {{/U}} {{/U}}by which {{U}} {{U}} 5 {{/U}} {{/U}}chocolate could cause spots? Spots occur when skin {{U}} {{U}} 6 {{/U}} {{/U}}become blocked with sebum. Millions of {{U}} {{U}} 7 {{/U}} {{/U}}living on our skin can cause a spot. Is there a process by which chocolate could {{U}} {{U}} 8 {{/U}} {{/U}}ache? One theory is that since chocolate is fatty it could lead to more sebum and more blocked pores. Another is that large quantities of chocolate could {{U}} {{U}} 9 {{/U}} {{/U}}the levels of some {{U}} {{U}} 10 {{/U}} {{/U}}, leading to an increase in sebum production.
One of the two studies looking at chocolate found the quantity of chocolate and {{U}} {{U}} 11 {{/U}} {{/U}}nuts made no difference to acne. The other study also found chocolate made no difference to acne. A study on more than 2,000 British soldiers suggested a possible link with {{U}} {{U}} 12 {{/U}} {{/U}}. But {{U}} {{U}} 13 {{/U}} {{/U}}studies meant that any {{U}} {{U}} 14 {{/U}} {{/U}}between food and acne was at best {{U}} {{U}} 15 {{/U}} {{/U}}. Then came the finding that no one in {{U}} {{U}} 16 {{/U}} {{/U}}populations in New Guinea and Paraguay had acne. Diet was back on the {{U}} {{U}} 17 {{/U}} {{/U}}. If diet makes a difference, then which kinds of foods have the biggest {{U}} {{U}} 18 {{/U}} {{/U}}on acne? Are they fat and sugar? The fact is that regardless of what people {{U}} {{U}} 19 {{/U}} {{/U}}, their acne gets better when they leave their {{U}} {{U}} 20 {{/U}} {{/U}}.