instruction:
Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].
question:
Washington (CNN) Cuban Foreign Minister Bruno Rodriguez Parrilla said today that the United States has provided no evidence for its claims that US diplomats in Havana have come under deliberate sonic attack  and raised the question of whether the Trump administration is using the diplomats' injuries to unwind recent progress in creating closer ties.
"There is no evidence  there is no evidence whatsoever  of the occurrence of the alleged incidents or the cause or origin of these ailments reported by US diplomats "  Rodriguez Parrilla  said today in Washington. "Neither is there any evidence suggesting that these health problems have been caused by an attack of any sort during their stay in Cuba."
"These health problems are being used as a pretext of a political character ... to harm bilateral relations "  Rodriguez Parrilla  said at a press conference at the National Press Club. "The US government should stop politicizing this issue."
 The Cuban minister  said that the United States hasn't provided  his  government with any proof to substantiate President Donald Trump's statement that Cuba is to blame for medical problems suffered by more than 22 US diplomats and family members  some of whom have reportedly suffered brain injuries.
 Rodriguez Parrilla  also slammed Trump for  his  rhetoric about the island nation  citing the "repeated disrespectful and offensive statements on Cuba by the US president." Trump's rhetoric is responsible for "re-launching the hostile rhetoric of the periods of sharpest confrontation "  he  said.
 He  added that anyone who claims the diplomats' health problems are the result of an attack is "deliberately lying."
answer:
Cuban Minister rejects US claims on sonic attacks


question:
"Did they cut more calories from their diet ... or did they become more physically active?" asked study author Kevin Hall   a senior investigator with the National Institute of Diabetes and Digestive and Kidney Diseases.
 Hall  had been "puzzled by how quickly the contestants were losing weight." So he contacted the show's physician and began studying the season eight contestants.
Early on   Hall  observed that weight loss was better predicted by food intake  not physical activity alone. But in the long term  the opposite was true.
"You have to be very physically active in order to keep the weight off  " Hall  said.
 Hall 's findings echo previous studies that promote more exercise for long-term weight loss maintenance. However  experts caution that doesn't mean people can neglect their diets in the long run  either.
This method  however  was not able to tell how much of the physical activity was due to normal daily activities -- like cleaning the house or walking the dog -- versus following a workout plan   Hall  said.
Six years later  however  the contestants' resting metabolisms still hadn't sped back up   Hall  showed in a study last year.
For  Hall   metabolic changes are just one part of the puzzle. Genetics may also play a role  as well as social factors that can make it hard for some people to incorporate so much exercise in their daily lives.
 Hall  added that it's not necessarily those who were most physically active during the competition who kept it up six years later.
answer:
How some 'Biggest Losers' keep the weight off


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Image copyright Getty Images Image caption Qantas chief Alan Joyce hopes to sell non-stop flights from Sydney to London and New York by 2022
"Today's result comes from investing in areas that provide margin growth and a network strategy that makes sure we have the right aircraft on the right route  " chief executive Alan Joyce  said.
On the international front  however   Mr Joyce  said the firm had faced more seats in the market together with rising fuel costs.
But Qantas International "had largely held its own  with a 6% decline in profit and a slight rise in unit revenue "  he  said.
answer:

Qantas Airways sees record half year profits