Every morning, retired plastic surgeon Jim Johnson has a small bottle of liquid with his breakfast. It’s not fruit juice or yoghurt — instead, the 76-year-old is drinking a supplement packed with ketones.These are molecules the body naturally produces and uses as fuel when it is running low on energy from carbohydrates — and instead, burns fat for fuel.‘When I take it, I can feel the effect within about half an hour,’ Dr Johnson, a grandfather of six from Marin County, , told Good Health. ‘I feel sharper, more able to focus — and happier. It has, over time, also improved my strength. I can lift weights more times than I used to.’
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