内容摘要：Dr Rueger explained: "It's not just them going on a diet and losing lots of weight, but they're actively changing their size and making themselves into a smaller individual that needs less food and is more efficient with oxygen."

Dr Rueger explained: "It's not just them going on a diet and losing lots of weight, but they're actively changing their size and making themselves into a smaller individual that needs less food and is more efficient with oxygen."

UK steelmakers said US President Donald Trump's decision to double import taxes on steel and aluminium to 50% is "yet another body blow" to the industry.Trade group UK Steel warned some orders could be delayed or cancelled, with uncertainty surrounding some shipments which are already halfway across the Atlantic.

Trump's new 50% import tax will come into effect on Wednesday. It will replace the 25% import tax that the US president announced earlier this year.A UK government spokesperson said it was engaging with the US on the implications of the latest tariff announcement to provide clarity to the industry.The US agreed on 8 May to drop import taxes on UK steel as part of a trade deal with the UK, but the original 25% tariff has been kept in place while the details of the deal are worked out.

UK Steel director general Gareth Stace said: "The deal that Prime Minister Sir Keir Starmer and President Donald Trump struck just a few short weeks ago is yet to be finalised, so this doubling of tariffs plunges the UK steel industry further into confusion...it is yet another body blow for all UK steelmakers in this torrid time."UK steel companies are this morning fearful that orders will now be cancelled, some of which are likely being shipped across the Atlantic as we speak."

Mr Stace said the trade group would now be "pressing our government to finalise the agreement to eliminate UK steel import tax and for it to come into effect urgently".

"UK steelmakers should not have to shell out for this new steep hike in US steel tariffs - all we want is to continue producing the steel our US customers value so highly," he said.However on Thursday, US Treasury Secretary Scott Bessent had said trade talks with China had become "a bit stalled".

Bessent told Fox News on Thursday: "I think that given the magnitude of the talks, given the complexity, that this is going to require [leaders of both the countries] to weigh in with each other."Trump's global tariff regime was dealt a blow on Wednesday following a ruling that he had exceeded his authority. His plans have been temporarily reinstated after the White House appealed the decision.

His administration this week also moved to "aggressively" revoke the visas of Chinese students studying in the US, of which there are an estimated 280,000.In Geneva, Washington and Beijing had agreed to reduce tariffs imposed on each other's imports in a deal where both nations cancelled some tariffs altogether and suspended others for 90 days.