A study of over 11,000 Canadian adults published in Public Health Nutrition found that those who cooked dinner at home more than five times per week consumed an average of 137 fewer calories per day, 4.3 grams fewer fat per day, and significantly more fibre, fruit, and vegetables than those who cooked dinner fewer than three times per week. These differences, maintained over years, produce substantial differences in weight, metabolic health, and mortality risk.
Why Cooking Determines Diet Quality
Cooking from whole ingredients is incompatible with ultra-processed food consumption. When you cook, you know exactly what is in your food. You control the oil quality, the salt content, the presence of additives, and the proportion of vegetables, protein, and carbohydrates. Restaurant food and takeaways typically use cheaper refined oils, higher salt, and more refined carbohydrates than home cooking because these reduce costs while maintaining palatability. Even high-quality restaurant food is cooked without knowledge of your specific nutritional needs.
Practical Starting Points
- Master five to seven base recipes that can be varied with different proteins and vegetables: a basic stir-fry, a simple soup, a sheet pan roast, a lentil dal, a simple egg dish
- Batch cooking on weekends provides whole food meals for weekday evenings when time is limited
- Invest in equipment that reduces preparation time: a sharp knife, a food processor, and a slow cooker make whole food cooking significantly faster
- Focus on simple preparations: a piece of grilled salmon with roasted vegetables and olive oil requires less than 30 minutes and is nutritionally superior to most restaurant meals