How to lose body fat through Ironman training

Today on Coffee & Questions ☕️ I talked about one of the most common questions I get from triathletes and Ironman athletes - how to lose body fat while still maintaining energy and performance through training.

Why Body Composition Matters for Ironman Performance

Carrying excess body fat means carrying dead weight - particularly up hills and through the run. However, the process of losing body fat while training for Ironman is complex and must be done carefully so that it doesn't impair training quality, recovery or health.

My Top Tips for Losing Body Fat Through Ironman Training

1. Fuel for performance, not just for fat loss

The biggest mistake athletes make is under-fuelling training sessions in an attempt to lose weight. This backfires - you end up with poor training quality, slower recovery, and often end up overeating later. Fuel your key sessions properly.

2. Create your calorie deficit strategically

A small energy deficit (200-300 calories) is safer for athletic performance than aggressive restriction. Avoid cutting calories on big training days - instead create a deficit on low-intensity or rest days.

3. Prioritise protein

High protein intake helps preserve muscle mass during a calorie deficit. As an endurance athlete, aim for 1.6-2.0g of protein per kg of body weight per day. Distribute protein across all meals and snacks.

4. Don't skip carbohydrates

Carbohydrates are your primary fuel source for training. Carb cycling or fuelling key sessions with carbs and reducing them on easier days can support fat loss without compromising performance.

5. Focus on food quality

Prioritise nutrient-dense, whole foods. Reduce processed foods, refined sugars and alcohol. These are easy wins for reducing calorie intake without compromising nutrition quality.

6. Timing matters

Don't try to lose body fat during peak training or race season. The best time for body composition goals is the off-season or early base phase when training loads are lower.

7. Work with a Sports Dietitian

Body composition changes for endurance athletes need to be done safely and strategically. A Sports Dietitian can help you develop a personalised plan that supports both performance and your body composition goals.

If you need help developing your own body composition strategy while maintaining Ironman performance, book a consult with me here.