Reverse dieting or metabolic rehabilitation is a strategy that can be particularly helpful for individuals who have been through a cycle of yo-yo dieting and have restricted calories too much for too long.
Why Calories Matter: The Metabolic Adaption
When you consistently eat below your body’s energy needs, your body adapts by slowing down its metabolic processes to conserve energy. This is called metabolic adaptation or sometimes “starvation mode,” though the latter is a bit of an inaccurate term.
Essentially, the body adapts to using fewer calories for basic functions.
1. Lowered Basal Metabolic Rate (BMR)
Your BMR is the number of calories your body needs for basic functions like breathing, digestion and maintaining body temperature. Prolonged calorie restriction causes your BMR to drop as your body tries to preserve energy.
2. Decreased Non-Exercise Activity Thermogenesis (NEAT)
NEAT refers to the calories burned from everyday activities like walking, cleaning, and even fidgeting. When you’re eating too little, your body may also reduce NEAT, meaning you move less unconsciously to save energy.
Prolonged calorie restriction can affect hormones involved in hunger, energy expenditure, and fat storage. Leptin (which helps regulate hunger) drops, while ghrelin (the hunger hormone) rises, making you feel hungrier, but your body is less efficient at burning calories.
4. Loss of Lean Muscle Mass
If you’re not earring enough protein or engaging in resistance training, the body may begin to break down muscle tissue for energy. Muscle burns more calories at rest than fat, so this results in a lower calorie burn overall.
This all leads to a scenario where you may be eating very little, but still not losing weight – or worse, gaining weight after eating slightly more than usual. This is because your metabolism has essentially “down regulated” itself to adapt to the lower calorie intake.
The Importance of Reverse Dieting
If you’ve been on a long period of calorie restriction or yo-yo dieting, simply jumping straight back into a “normal” calorie intake can be risky. This is where slowly increasing your calorie intake becomes essential.
1. Gradual Metabolic Adjustment
By slowly increasing your calories, you give your body time to “readjust” and rev up its metabolism. This helps you avoid gaining weight too quickly and gives your body a chance to build up muscle mass, which can ultimately help increase your BMR.
2. Reducing the Risk of Fat Gain
If you increase your calories too quickly, the body is more likely to store excess energy as fat, especially if it’s still in “conservation mode.” A gradual increase helps prevent this and allows your body to use those extra calories for muscle repair and metabolic processes rather than fat storage.
3. Preserving Lean Muscle Mass
As you increase your calories, it’s important to prioritise protein intake and strength training to help build and maintain lean muscle mass. More muscle means a higher metabolism, which can help you burn more calories at rest.
4. Improving Hormonal Balance
Slowly increasing calories can help restore hormonal balance, particularly leptin and thyroid hormones, both of which play a role in regulating your metabolism and hunger. This makes it easier to manage your weight in the long term without feeling excessively hungry or fatigued.
How to Reverse Diet: Practical Steps
1. Start with a Small Increase
Gradually increase your daily calorie intake by about 50–100 calories per week. This is a conservative approach that gives your body time to adapt without overwhelming it.
2. Focus on Nutrient-Dense Foods
Prioritise whole, nutrient-dense foods like lean proteins, vegetables, fruits, whole grains, and healthy fats. This will not only provide energy but will also help balance blood sugar and restore metabolic health.
Monitor your weight, energy levels, and how you feel during the process. Some weight gain may happen initially, but this is often water retention or muscle rebuilding, not fat gain. If the rate of weight gain is excessive, you can slow down the calorie increase.
4. Incorporate Strength Training
Strength training is crucial during this phase because it helps rebuild muscle tissue, which in turn boosts your metabolism. Aim for at least 2–3 times per week of resistance exercises like weight lifting.
It may take several weeks or even months to fully restore your metabolism to a healthy level. Be patient and stay consistent.
The Benefits of Eating More
The goal of reverse dieting isn’t just to stop the restrictive cycle but to rebuild a healthy, sustainable metabolism. As you increase your calories and engage in proper exercise, your body’s efficiency improves, meaning you can eventually eat more while maintaining or even losing weight.
In the long run, by rebuilding your metabolism, you can sustain a higher caloric intake, avoid excessive hunger, and have more energy. This way, you break the cycle of yo-yo dieting and set yourself up for a healthier relationship with food and your body.