Researchers point to a variety of reasons behind the slowdown since 2011. Some of the "low hanging fruit" of improvements in heart disease and cancer, such as the cut in smoking rates, had already happened, making further gains harder.
At the same time, the UK saw rising risk factors, including obesity, poor diet and low levels of exercise, against a backdrop of widening social inequality and pressure on the NHS.
Some academics argue that austerity cuts to public services after the 2008 financial crash had a strong impact on life expectancy, while others say it's not possible to prove this directly.
Dementia and Alzheimer's disease is the leading cause of death in England and Wales, according to the latest official figures. Heart disease, lung disease, strokes, lung cancer also feature highly, along with flu in some years.
"Cardiovascular disease remains a leading killer in the UK," said Prof Bryan Williams OBE, chief scientific and medical officer at the British Heart Foundation.
"The plateau we have seen in reducing the number of deaths... is a serious cause for concern, made worse by the impact of the pandemic on an already overstretched health service."
He added that early deaths from cardiovascular disease had grown in the most deprived areas of England and called for "urgent government action" in its prevention, detection and treatment.