Key points from article :
MRI was used to research the impact of eating less than 800 calories a day on heart function.
Research was carried out on 21 obese volunteers, of an average age of 52 and a BMI of 37.
Volunteers ate a very low-calorie diet of 600 to 800 kcal per day for eight weeks.
After 1 week MRI showed that heart fat content had risen by 44%.
Crash diets are effective for losing weight, reducing BP, reversing diabetes.
Research was presented at CMR 2018, the annual meeting of the European Society of Cardiology.