The rules for creating babies from three people – which state only two would be classed as parents – have been announced by the UK government.

The fertility technique uses material from the mother, father and a donor woman to prevent deadly diseases.

MPs will soon vote on whether to make the UK the first country in the world to legalise the procedure. Opponents say it is unethical to make babies with DNA from three people and that it represents a “slippery slope”. The UK scientists that have led the research hope to offer the procedure next year. Some families have lost up to seven children to “mitochondrial diseases” that leave the body with insufficient energy to function.  Mitochondria are the microscopic power stations in nearly every cell of the body.  Defective mitochondria are passed only from mother to child so scientists in the UK have pioneered therapies that use functioning mitochondria from a donor woman.  However, mitochondria have a tiny amount of their own DNA so any resulting child would have genetic information from three people.

Fat ‘breathed out’ of body via lungs, say Fat can be breathed out as well as burned off as you lose weight, biochemists who have studied metabolism at a microscopic level say.

But they warn that people still need to huff and puff with exercise to keep slim – hyperventilating on its own will not do the trick.

The Australian team traced the route of fat out of the body as atoms.

Their findings are published in the Christmas edition of the British Medical Journal.

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