His current number (2130) comes from the UK's “Family food datasets”. The first thing you see when you open up the UK nutrient intake spreadsheet is this messag

His current number (2130) comes from the UK's “Family food datasets”. The first thing you see when you open up the UK nutrient intake spreadsheet is this message: > It is a widely recognised characteristic of self reported diary surveys such as Family Food that survey respondents tend to under report their purchases (and any derived nutrient intakes based on purchased quantities are also likely to be underestimates). Empirical comparisons of sales and duty data for alcohol in particular suggest that reported alcohol consumption could be 40-60 per cent lower than the reality. For other food and drink, reporting is likely to be closer to actual purchases, but underreporting is likely to feature and some food types may be underreported to a greater extent than others. Here's a paper that critiques the survey results in detail: http://38r8om2xjhhl25mw24492dir-wpengine.netdna-ssl.com/wp-content/uploads/2016/08/16-07-12-Counting-Calories-Final.pdf http://38r8om2xjhhl25mw24492dir-wpengine.netdna-ssl.com/wp-c...