The answer was loud and clear...

[keannu]

What does this "loud" mean here? The translation goes "evident or obvious", which I can't find in a dictionary.

mo1-27
ex)A few years ago, an interesting study examined why people who lose weight tend to regain most of their lost weight. The researchers follwed 350 people during the periods of weight loss and weight gain. Why did the subjects regain their weight? The answer was loud and clear...

 

[JMurray]

It's the whole phrase "loud and clear" that is idiomatic. It means unequivocal(ly), emphatic(ally), unambiguous(ly).
It can refer to a spoken communication: "When the teacher scolded the students for their bad behaviour, the message came across loud and clear."
Or some other form: "The protests were loud and clear in the community newspaper for several weeks following the closure of the library."

not a teacher

 

[anhnha]

You can see here: loud and clear - definition in American English Dictionary - Cambridge Dictionary Online

 

[JMurray]

Thanks for the link anhnha. As with some other definitions I've just checked, there is no mention of the phrase often having the connotation of "emphatic" or "forceful", as well as "easily understood". However I'll stick with my suggestion that "loud and clear" often implies forcefulness as well as clarity. Others may differ on this.

not a teacher