During a phase of caloric restriction, the body undergoes several physiological adjustments. Initially, the body uses up glycogen stores for energy, followed by tapping into fat stores through increased lipolysis. Hormonal changes occur, including elevations in glucagon and decreases in insulin, which facilitate fat metabolism. Additionally, the body may lower its metabolic rate to conserve energy, potentially slowing weight loss over time. Adaptations like muscle loss can also happen if protein intake is insufficient or if strength training is neglected, underscoring the importance of balanced nutrition and exercise during caloric restriction.