In this segment, Eric Roberts explains that the most effective cardio for weight loss is low‑intensity exercise that keeps the heart rate low enough to maintain a conversation. He argues that high‑intensity cardio primarily burns glycogen (stored carbs). Depleting glycogen triggers strong cravings for carbs and sugar as the body rushes to replenish its stores, which can increase hunger, lead to overeating, and sabotage the diet that ultimately drives fat loss. Therefore, even though high‑intensity sessions may burn more calories during the workout, they can create a hormonal environment that makes sticking to a calorie‑restricted diet harder. Roberts recommends keeping cardio intensity low, using the “talk test” (being able to converse comfortably) as a practical gauge of the appropriate heart‑rate zone.
