Macros for Keto: A Beginner’s Breakdown
The ketogenic diet relies on precise macronutrient ratios to shift your metabolism into ketosis. Unlike standard low-carb diets, keto requires tracking three macros: carbohydrates, protein, and fat. Getting these proportions right determines whether your body switches from burning glucose to fat for energy.
What Are Macros on Keto?
Macronutrients—commonly called macros—are the nutrients your body needs in large amounts. On keto, the typical breakdown is:
- 5-10% carbohydrates (20-50g net carbs per day)
- 20-25% protein
- 70-75% fat
This ratio forces your body to burn fat instead of glucose. Research shows very-low-carb ketogenic diets lead to greater weight loss and metabolic improvements than low-fat diets (Bueno NB et al., 2013). Net carbs (total carbs minus fibre) matter most, as fibre doesn’t impact blood sugar.
Why These Ratios Work
Carbohydrate restriction lowers insulin levels, allowing fat stores to be accessed for energy. Protein must be moderate—too much can convert to glucose through gluconeogenesis, potentially kicking you out of ketosis. Fat makes up the bulk of calories because it’s your primary fuel source once adapted.
A study comparing low-carb and low-glycemic diets found the ketogenic approach improved glycemic control more effectively in people with type 2 diabetes (Westman EC et al., 2008). This underscores the importance of strict carbohydrate limits.
What This Means in Practice
UK supermarkets make keto accessible. At Tesco, £3 buys 500g of mature cheddar (36g fat, 0g carbs per 100g), while Sainsbury’s sells cauliflower rice (2.9g net carbs per 100g) for £1.50 per bag. Seasonal UK vegetables like Brussels sprouts (5g net carbs per 80g) work well in winter.
Tracking apps simplify macro counting. Weighing food—especially nuts and dairy—ensures accuracy. A typical day might include:
- Breakfast: Scrambled eggs with spinach (2g net carbs)
- Lunch: Chicken thigh with broccoli (5g net carbs)
- Dinner: Salmon with asparagus (3g net carbs)
the keto adaptation timeline varies, but sticking to these macros accelerates the process.
Common Macro Mistakes
Overeating protein is frequent. A 150g chicken breast has 46g protein—fine for most, but exceeding needs hampers ketosis. Hidden carbs in sauces, milk, or processed foods also derail progress. Always check labels.
Underestimating fat intake is another pitfall. Adding olive oil, butter, or avocado boosts fat without excess protein. common keto electrolyte mistakes like neglecting sodium can also impact energy levels.
Frequently Asked Questions
How do I calculate my keto macros?
Use an online calculator based on your weight, activity level, and goals. Most suggest 20g net carbs to start, then adjust protein (1.2-2.2g per kg of lean mass) and fill the rest with fat.
Can I eat fruit on keto?
Berries (e.g., 6g net carbs per 100g raspberries) fit in moderation. Bananas (20g net carbs each) and grapes (16g per 100g) are too high for most.
What if I go over my carb limit?
One high-carb meal won’t ruin progress, but consistent overages prevent ketosis. Return to strict macros the next day.
The Bottom Line
Mastering macros for keto requires attention to detail but becomes intuitive. Prioritise whole foods, track diligently, and adjust based on how your body responds. If you’d rather not do the macro maths yourself, the Keto Dieting app does it for you on Google Play and the App Store.
References
- Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T (2013). Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition. https://doi.org/10.1017/S0007114513000548
- Westman EC, Yancy WS, Mavropoulos JC, Marquart M, McDuffie JR (2008). The effect of a low-carbohydrate, ketogenic diet versus a low-glycemic index diet on glycemic control in type 2 diabetes mellitus. Nutrition & Metabolism. https://doi.org/10.1186/1743-7075-5-36
