As we discussed in the previous text, metabolic adaptation is a set of processes through which our body can further decrease calorie expenditure, or the energy required for normal bodily function, at a new, lower body mass. The more kilograms we lose, the more pronounced these adaptations become, involving changes in hormonal panels, mitochondrial efficiency, and energy expenditure through planned physical activity (exercise) or unplanned daily movements.
Leptin, as one of the central molecules secreted by fat cells, has become part of research. If hormonal changes are directly linked to leptin secretion, why not simply provide exogenous leptin to people and attempt to reduce the disproportionate drop in energy expenditure compared to the expected amount after losing body mass? Although studies show potential benefits of leptin injections, such as reduced appetite and better hormone regulation, significant problems remain—enormous cost, limited availability of leptin for "normal" use, and the preference to regulate body mass through other means.
Body Changes in a Concrete Example
Understanding that our body wants to reduce energy after a prolonged period of caloric deficit, leading to a tendency to move less and engage in other unconscious actions that burn calories, we can observe certain things. For example, in our colleague Christian's preparation for a bodybuilding competition, I witnessed changes in his behavior and movement. In the extreme phase (very low body fat percentage), these consequences are highly noticeable—slow and brief responses during conversations, minimal hand gestures, and sluggishness after cardio, indicating his body's effort to conserve energy for other metabolic processes.
Tracking Daily Steps
A viable tip is tracking movement by counting steps using a smartwatch or phone. This strategy is suitable for monitoring the "general state" of your activity and can be effective during a diet to maintain an increased level of activity. However, it's crucial not to become overly obsessed with step counting and avoid causing disproportionate stress. While physical activity is a good indicator of your readiness for self-improvement, dietary regulation is the primary factor for long-term weight loss.
Linear Weight Loss
The described mechanisms cannot be entirely avoided as they respond to our body's energy deficiency. Most people aiming to lose weight reduce their calorie intake by 300-500kcal daily on average, leading to weight loss. The suggested weekly weight loss range is 0.5-1% of body weight. Gradual and controlled weight loss helps mitigate metabolic adaptation, although it remains present, leading to the mentioned changes but to a lesser extent.
Manipulating Daily/Weekly Caloric Intake
While calories ultimately determine weight loss, organizing our diet can make the process easier. Maintaining a higher protein intake, possibly exceeding 2g per kilogram of body weight, helps preserve muscle mass during weight loss. Adjusting fat intake to meet a minimum requirement (around 0.7g/kg body weight) and filling the rest of the calories with carbohydrates allows for flexibility. Manipulating calories on a daily/weekly basis, rather than focusing on a daily deficit, can offer a more sustainable approach.
Diet Breaks
Taking breaks from a diet is an excellent technique for those engaging in a prolonged diet. During these breaks, you consume calories to maintain your newly acquired body mass rather than the amount needed for weight loss. This approach requires adjusting caloric intake based on the initial caloric needs for maintaining the old body mass. Diet breaks provide benefits such as easier maintenance, less mental strain, reduced metabolic adaptation, and likely improved performance in the gym.
Sleep
Quality sleep is a crucial factor often overlooked. Lack of optimal fat loss, muscle maintenance, and gym progress can result from inadequate sleep in terms of both quantity and quality. Proper sleep hygiene practices include limiting exposure to blue light, avoiding caffeine several hours before bedtime, sleeping in a dark and cool room, and maintaining a consistent sleep schedule.
Cardio
Adding cardio to diet and weight training is common for weight loss. However, introducing cardio should be gradual to minimize interference with strength training progress. Balancing cardio intensity and duration, along with a consistent daily activity level and calorie intake, can increase calorie expenditure. Individual preferences and goals play a significant role in determining the optimal approach to incorporating cardio into a fitness plan.
Metabolic adaptation is inevitable and varies based on individual factors. Preferences, goals, initial conditions, diet duration, previous training, genetics, and other parameters make diets and workouts highly individualized. We hope this text has shed light on some issues and solutions. If this complexity is overwhelming, consider our Online Coaching services, where we guide you through the entire process.
