# Fuel for Training: Why Protein First Beats Carb Loading for Most Active People Source: https://a1c.io/updates/performance-nutrition-protein-first/ Published: 10 Nov 2026 Updated: 10 Nov 2026 Topics: Lifestyle ![Fuel for Training: Why Protein First Beats Carb Loading for Most Active People](https://cdn.sanity.io/images/xc1c8ly2/production/383cf08fd4fb8afebe01df82f9062af7f8a09583-1080x1080.jpg) > Carb loading helps in long events. For most training, protein plus carbs matched to the session works better and is kinder to your blood sugar. Carb loading has a good reputation. It works in one narrow case. For most people who train, a plan built on protein, with carbs matched to the session, does more for performance and for blood sugar. ## When does carb loading help? Carb loading means eating a lot of carbohydrate for a day or two before an event, to fill your muscle fuel stores. It has a clear benefit in long events, past about 90 to 120 minutes: a marathon, ultra running, a long triathlon, many hours on a bike. Even there, athletes still need enough protein. For strength sports, team sports and sessions under about 90 minutes, the benefit is smaller or less consistent. A normal, well-fed day already covers it. ## What matters more for most people **Protein, every meal.** Protein repairs the muscle you train. The review behind this post suggests about 1.4 to 2.0 grams per kilo of body weight per day for most active people, spread across 3 to 4 meals of roughly 20 to 40 grams each. Heavier strength blocks need more. **Carbs matched to the work.** More carbohydrate before and after long or hard sessions. Less on rest days and easy days. Choose whole, minimal-processed sources, such as rice, potatoes, fruit and whole grains. **Fat, 20 to 30 percent of energy.** Nuts, seeds, avocado, olive oil and oily fish support hormones and recovery. **A pattern, not a pre-race pasta night.** What you eat across weeks decides your muscle, your recovery and your blood sugar. One big meal does not. ## What does a plate look like? Start with the protein: eggs, fish, chicken, tofu, tempeh, dairy or legumes. Add vegetables. Then add carbohydrate to fit the session: a small portion on a rest day, a larger one before or after a long run. ## Why does blood sugar come into it? A diet built on refined carbohydrate every day is linked, in large studies, to weight gain and to less stable blood sugar over the years, even in people who train. These are links, not proof of cause. They still make "more carbs, always" a poor default for most active people. People also differ a lot. Two athletes can eat the same meal before the same session and see very different glucose curves. A glucose sensor can help you see your own response. It is an option, not a requirement, and it does not replace advice from a sports dietitian. ## By sport, in short - **Strength and power:** protein matters most. Carbs support training volume. - **Team sports:** carbs through the day, and a small amount during play if it runs long. Protein after. - **Endurance over about 90 to 120 minutes:** carb loading and in-session fuel make sense, with protein kept up. ## When to get advice If you train hard and eat very little, lose weight fast, or feel tired for weeks, see a doctor or sports dietitian. A1C Insights is an app, not a medical device, and cannot say what you should eat. ## What you still control Pick one change this week. Put protein in the first meal of the day, or add a carb portion only on your long-run day. Keep it for two weeks and see how you feel. ## Frequently asked questions ### Is carb loading worth it? In long events, past about 90 to 120 minutes, it has a clear benefit. For strength sports, team sports and sessions under about 90 minutes, the benefit is smaller or less consistent. ### How much protein do active people need? The review behind this post suggests about 1.4 to 2.0 grams per kilo of body weight per day, spread across 3 to 4 meals of roughly 20 to 40 grams each. Heavier strength blocks need more. Check the figures with a sports dietitian. ### Does what I eat affect my blood sugar if I train? Yes. A diet built on refined carbohydrate every day is linked, in large studies, to weight gain and less stable blood sugar over the years, even in people who train. These are links, not proof of cause. ### Do I need a glucose sensor to eat this way? No. A sensor is an option. It can help you see your own response to a meal before a session, and it does not replace advice from a sports dietitian. --- A1C Insights is an app, not a medical device. This article is general education, not medical advice.