Fresh and/or healthy food shortages yes, higher prices for the available fresh/healthy food, yes, but those who are currently obese will probably find alternatives, and may not be eating fresh/healthy foods anyway.
If the diabetes issue is not sufficiently addressed, if there are real shortages of medicine, and if the shortages of fresh/healthy food is allowed to continue (with the associated higher prices) it might very slightly affect the data. But to all intents and purposes, one would hope that the government comes to its sense before that.
Although there is always the possibility that the NHS could be severely affected which might proportionately affect life expectancy.
It is not rumour. It is a possibility, or even a probability that driving permits will be required. But with those permits driving in EU will still be allowed. The post office and DVLC may be overworked for a time, but so will everyone else.
Flying to anywhere may not be possible or severely limited, for a time, or until new arrangements are introduced, which will take time.
If the there are food and medicine shortages, resulting in reduced life expectancy, loss of jobs, reduced incomes, limited production, increased poverty, increased crime, etc, and the government refuses to retreat from their ideological position, who knows what will happen.
But I suspect either the government will have retreated before then, or there will be another referendum, or there will be a GE.
