Clean eating became a marketing term, weaponised by influencers selling juice cleanses and superfood powders, and then dismissed by parts of the nutrition establishment as both scientifically meaningless and psychologically harmful. This dismissal throws out something genuinely important. Stripped of its commercial accretions, clean eating means eating predominantly whole, minimally processed foods. And for that principle, the evidence base is unambiguous.
What the Evidence Actually Supports
Ultra-processed food consumption is associated with higher all-cause mortality in multiple prospective cohort studies across different populations. Each 10 percent increment in ultra-processed food in the diet is associated with a 14 percent higher cancer risk and a 12 percent higher risk of cardiovascular disease. These are population-level findings from hundreds of thousands of participants followed for years. The principle underlying clean eating, that minimally processed food is substantially healthier than ultra-processed food, is not contested in serious nutritional science.
What Clean Eating Actually Means in Practice
- Foods that are recognisable as their original ingredient: an egg, a piece of salmon, a handful of spinach, a bowl of oats
- Foods with a short, recognisable ingredient list: live yoghurt contains milk and live cultures; sourdough bread contains flour, water, and salt
- Foods that require some preparation rather than just opening a packet
- Foods that would spoil if left unrefrigerated for a week: if it would not spoil, question what is in it
- No specific food group is excluded; no magic foods are required