Whole-food diet adherence means you really can eat much more and be well-nourished but still consume far fewer calories

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January 20, 2026, 10:53 AM

• •People on an unprocessed diet ate 57% more food by weight but consumed fewer calories.
• •The unprocessed diet prioritized micronutrient-rich foods like fruits and vegetables.
• •Ultra-processed foods deliver both high energy and micronutrients, potentially leading to calorie overload.
• •The research supports the concept of 'nutritional intelligence' in food choices.

Research from the University of Bristol reveals that people consuming an unprocessed diet ate over 50% more food than those on a ultra-processed food diet, yet consumed 330 fewer calories daily. This is because those on the unprocessed diet chose to load up on fruit and vegetables, which are lower in calories, rather than calorific options. This suggests humans have a 'nutritional intelligence' to balance enjoyment, nutrition, and fullness. The findings highlight how today's fast food culture impairs this natural ability.

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