You're writing a blog post about how you think America should solve the problem of having too many overweight people. You're introducing the topic. You write:
Over one in five Americans suffer from obesity.
over (a number)
In writing or formal speeches, you use "over" to mean "more than" some number:
Over 20% of our employees have Master's degrees or Ph.D.'s.
Over 500 people have signed up to volunteer.
(a number) in (a number)
You can use "1 in 10" to mean 10%, "2 in 100" to mean 2%, and so on. People usually express numbers in this way in writing or when speaking about a topic that they've researched and are prepared to talk about.
(people) suffer from obesity
When a person has a long-term health problem, you say that they "suffer from" that problem:
suffer from depression
suffer from insomnia (not being able to sleep)
suffer from lower back pain
"Obesity" means being very, very overweight. "Obesity" is a technical term that is used by doctors, but normal people also use it when talking about fatness as a general problem:
Obesity is a serious problem in the U.S.
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