Macronutrients: The Basics
| Macronutrient | Calories/g | Key Role | Best Sources |
|---|---|---|---|
| Carbohydrates | 4 | Primary fuel (glucose for brain) | Oats, legumes, vegetables, wholegrains |
| Protein | 4 | Muscle repair, enzymes, immune function | Fish, poultry, legumes, eggs, dairy |
| Fat | 9 | Hormones, cell membranes, fat-soluble vitamins | Olive oil, nuts, avocado, oily fish |
| Fibre | ~2 (partially fermented) | Gut microbiome, LDL reduction, satiety | Vegetables, legumes, oats, wholegrains |
The Mediterranean Diet: What the Evidence Shows
- Extra virgin olive oil as the primary fat — associated with 30% lower cardiovascular events (PREDIMED trial)
- Fish at least 2× per week — omega-3s reduce triglycerides and inflammation
- Abundant vegetables, legumes, and wholegrains — high fibre, anti-inflammatory
- Moderate nuts (30g/day) — associated with longevity in large cohort studies
- Limit red meat to <1–2 servings/week
- Limit ultra-processed foods — associated with all-cause mortality in multiple large studies
The 80/20 RuleYou don't have to eat perfectly all the time. Eating a healthy, varied diet 80% of the time and allowing flexibility the rest significantly outperforms an all-or-nothing approach.
Ultra-Processed Foods
Foods with 5+ artificial ingredients (emulsifiers, sweeteners, flavourings) that are industrially produced — crisps, ready meals, sugary cereals, processed meats. Associated with 32+ adverse health outcomes in a major 2024 meta-analysis.
Is breakfast the most important meal?
No — this is a marketing myth. Meal timing matters less than total food quality and quantity. Some people thrive with breakfast; others don't need it. Intermittent fasting is safe for most healthy adults.
Does eating fat make you fat?
No. Dietary fat does not directly cause body fat accumulation. Calories in vs. calories out determines weight. Fat is calorically dense, so portion size matters.
Are plant-based diets healthier?
Well-planned plant-based diets are associated with lower rates of heart disease, type 2 diabetes, and certain cancers. They require attention to B12, iron, omega-3, calcium, and vitamin D.
How much protein do I need?
The general recommendation is 0.8–1.0 g/kg of body weight per day. For active individuals building muscle or elderly adults preserving muscle mass, 1.2–1.6 g/kg/day is more appropriate.
Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.