医学考博每日一读：Only one in five eats five a day

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Just one in five Britons eats the recommended five portions of fruit and vegetables a day, a poll for World Cancer Research Fund (WCRF) suggests.
6 _6 Z8 F, Y) G) T3 f) ZThe Department of Health first launched its five-a-day campaign in 2003.
; T% D, k7 Q" j" q1 _0 IBut the WCRF says its survey of more than 2,000 UK adults shows people still find achieving that goal difficult.
9 f2 [" c6 o" R9 g* AIt is urging people to eat "just one more portion" for a healthier diet, which would increase cancer protection.
, h: k/ R4 N7 i$ D; ~: `' G  T5 RThe YouGov survey for the WCRF found that, on average, 17% of lower income households (social groups C2, D and E) eat at least five portions per day, compared with 27% for those in higher income groups.
Fruit and veg consumption levels were lowest in the north of England, where 18% had five or more portions daily.
The highest levels of consumption were reported in the south of England, where 26% said they ate at least five portions.
; F; u; }3 X1 k( _% j& ?In London, it was 21%, in Scotland 22% and in Wales 23%.
$ }$ j5 s5 W; M6 }. p) rKate Mendoza, head of education for the WCRF, said: "These figures show that many people are still finding it difficult to follow the healthy eating message.
: U$ Q4 u6 M: B+ l3 X"Getting at least five portions of fruit and vegetables a day is the building block of a healthy diet. Not only are fruit and veg a good source of nutrients, they also tend to be low in calories and full of fibre and so help us maintain a healthy weight.
"A diet based on plant foods, such as wholegrains and pulses as well as fruit and vegetables, can reduce cancer risk as research shows they protect against a range of cancers. Recent research has confirmed that foods containing fibre reduce the risk of bowel cancer.
/ v$ K6 r# G' e) Q$ x. z"Although people are more aware of the significance of eating five a day than they used to be, it is clear that there are still barriers to incorporating plant foods into our daily diets," she added.
# W" R  D3 j4 ]& i& U% DThe charity is holding an awareness day, "Fruity Friday", on 18 May as part of Cancer Prevention Week.
A Department of Health spokesperson said: "We know we need to do more to encourage people to eat their five a day and help prevent diseases like cancer.

"That is why, through our Change4Life campaign, we invested around