Your body uses stored sugar (glycogen) first for quick energy, then shifts to burning fat for fuel, but it will also break down muscle (protein) for energy if needed, especially during prolonged deficits or lack of protein, to create glucose for the brain and other tissues. While fat is the primary fuel source during steady exercise and calorie restriction, losing muscle slows metabolism, so it's crucial to combine a moderate deficit with protein and strength training to preserve it.
Although your body breaks down carbohydrates and fat first when you work out, it may eat into muscle for necessary energy unless you take necessary steps. Your body begins breaking down protein after your available fat stores have been consumed. We typically exercise to build and strengthen our muscles.
If the scale is going down, but your lifts are going up or staying constant, you are losing fat. If the scale is going down, and your strength is going down as well, you are burning some muscle.
You can lose both depending about the type of illness but fat is usually decreased first and water from the muscles which can easily be replenish by balancing electrolyte level.
Too much or too intense of cardiovascular training may exacerbate muscle loss. Start by slowly dropping your daily calorie consumption. Keep an eye on your weight and try to reach a point where you lose around 1-2lbs per week. Any more and you risk excess muscle wasting.
When your body accesses and burns stored body fat this leads to weight loss. Becoming a fat burner also means you will feel satisfied longer, can go 3-6 hours between meals, will have fewer cravings, and snack less.
Signs like increased energy and reduced waistline are long-term indicators of fat burning.
5 phases of a weight loss journey
The most common stubborn fat areas include the belly, thighs, hips, lower back, upper arms, and neck. These regions tend to store fat more easily and resist weight loss, making them challenging for many people. Fat in these areas is often influenced by factors like hormones, genetics, and lifestyle choices.
The 3-3-3 rule for weight loss is a simple, habit-based method focusing on three key areas: 3 balanced meals a day, 3 bottles (or ~1.5L) of water by 3 PM, and 3 hours of physical activity per week, aiming for consistency over complex diets. It simplifies fat loss by establishing rhythm through consistent eating, adequate hydration to support metabolism, and regular movement, promoting sustainable health without intense calorie counting or restrictive rules, says Five Diamond Fitness and Wellness, Joon Medical Wellness & Aesthetics, and EatingWell.
At 22% body fat, men often have a softer midsection, less muscle definition, and a healthy but not overly lean look, while women typically appear athletic and toned, with some ab definition visible when flexing and definition in arms and legs, sitting in the "fitness" or "average" range for both genders, though visual appearance varies by individual.
You're losing fat but gaining muscle
If you are eating well and going to the gym but aren't seeing a shift in the scale, it may be because you are gaining muscle, which is more dense than fat. This means you could weigh the same, even if your body composition has changed.
After prolonged periods of starvation this store of glycogen runs out, and the body then starts burning fat reserves and consuming muscle and other tissues and uses the proteins within muscle tissue as a fuel source, which results in muscle mass loss.
Common Cutting Mistakes
Adele's significant weight loss wasn't from a quick fix but a two-year journey combining intense, varied workouts (strength training, Pilates, boxing, hiking, cardio) and lifestyle changes, driven largely by addressing anxiety and improving her mental health, though she also worked with trainers and focused on eating more whole foods while denying specific restrictive diets like intermittent fasting. She described getting "addicted" to exercise, often training multiple times daily, emphasizing getting stronger, not just losing weight.
The key to lasting weight loss isn't about shortcuts—it's about mastering the three C's: Consistency, Change, and Control. By focusing on these principles, you can build healthy habits, stay on track, and reach your goals with confidence.
Some studies suggest that sleep plays a role in weight loss, and specifically fat loss, during calorie restriction. In a study of people undergoing 14 days of calorie restriction, the participants lost less fat when they spent 5.5 h a day in bed than when they spent 8.5 h a day in bed [40].
The “whoosh effect” is when you suddenly seem to lose a lot of weight after stalled weight loss. One theory is that it's fat cells releasing previously held water. There's no real science behind it, but people report the whoosh effect anecdotally.
Why Fat Burning Drinks Work
HIIT increases fat burning more than aerobic exercise, finds a study published in the British Journal of Sports Medicine .