06/06/2024
When it comes to weight loss, how many calories you consume might be more important than when you consume them, challenging the popularity of intermittent fasting, according to a new study of time-restricted eating by researchers at Johns Hopkins University published in the last two months.
Moreover, another study of over 20,000 adults found that those who followed an 8-hour time-restricted eating schedule, a type of intermittent fasting, had a 91% higher risk of death from cardiovascular disease.
People with heart disease or cancer also had an increased risk of cardiovascular death.
Compared with a standard schedule of eating across 12-16 hours per day, limiting food intake to less than 8 hours per day was not associated with living longer.
So, is intermittent fasting safe?
There’s no simple answer to this question. Randomized controlled trials have shown it appears a safe option for weight loss in the short term.
However, people in the NHANES dataset who eat within a limited period of the day appear to be at higher risk of dying from heart disease. Of course, many other factors could be causing them to eat in this way, and influence the results.
When faced with conflicting data, it’s generally agreed among scientists that randomized controlled trials provide a higher level of evidence. There are too many unknowns to accept the conclusions of an epidemiological study like this one without asking questions. Unsurprisingly, it has been subject to criticism.
That said, to gain a better understanding of the long-term safety of intermittent fasting, we need to be able follow up individuals in over five or ten years.