Weight Loss: the complete guide (without crash diet)

14 min read

Weight loss. There is no topic in the fitness world about which more lies are told. Detox diets, meal replacements, 30-day challenges - they promise miracles and deliver disappointment. The truth is less sexy but much more effective: weight loss is about a few basic principles that you apply consistently. In this guide we explain everything you need to know to lose weight healthily and sustainably, without a crash diet.

The foundation: the calorie deficit

Every diet that works - keto, intermittent fasting, paleo, Weight Watchers - works because it puts you in a calorie deficit. You eat less energy than you burn, and your body takes the difference from your fat reserves. This is not an opinion, it is thermodynamics. Hall et al. (2011) confirm that energy balance is the primary factor in weight change.

But how much of a deficit do you need? A deficit of 300 to 500 kcal per day is the sweet spot. This results in weight loss of about 0.3 to 0.5 kilos per week. Sounds slow? Do the math: that's 15 to 25 kilos per year. And most importantly: you can sustain it.

A larger deficit (more than 750 kcal per day) sounds tempting, but it has drawbacks: you lose muscle mass, your metabolism adapts, your hormones get disrupted, and the chance of binge eating increases. Trexler et al. (2014) show that aggressive dieting leads to metabolic adaptation - your body becomes more efficient with energy, allowing you to eat less and less for the same result.

The best diet is the diet you can sustain. Not the diet that promises the fastest result.

Protein: your most important ally

When you lose weight, you don't just lose fat. Without the right approach, you also lose muscle mass. And you want to prevent that, because muscles burn energy at rest, they give your body shape, and they make you stronger in daily life.

The solution: eat enough protein. Helms et al. (2014) advise 1.8 to 2.7 grams of protein per kilo of body weight during a calorie deficit. That's more than normal, and there's a reason for that: in a deficit, your body needs extra protein to protect muscle mass.

In practice for someone of 75 kilos: that's 135 to 200 grams of protein per day. Sounds like a lot? Divide it over 4 to 5 meals. Think of eggs for breakfast, chicken or fish for lunch, cottage cheese as a snack, and meat or legumes for dinner.

Strength training: preserve what you have

Most people who lose weight only do cardio. That's a mistake. Cardio burns calories, but it doesn't give your muscles a reason to stay. Strength training does. It is the strongest signal your body gets to maintain muscle mass during a calorie deficit.

You don't have to become a bodybuilder. Two to three strength training sessions per week is sufficient. Focus on compound exercises that target multiple muscle groups at once:

• Squats - legs and glutes
• Deadlifts - back, glutes and hamstrings
• Bench press - chest, shoulders and triceps
• Rowing - back and biceps
• Overhead press - shoulders and triceps

Train with an intensity of 7-8 on a scale of 10. Heavy enough to stimulate your muscles, but with enough margin for good technique.

Cardio: useful but not sacred

Cardio is a tool, not a requirement. It burns extra calories, it's good for your heart and it helps with stress reduction. But you can lose weight perfectly fine without running a meter - as long as your nutrition is in order.

If you do cardio, choose something you enjoy. Walking, cycling, swimming, a group class - it doesn't matter. Consistency is more important than intensity. Three times a week 30 minutes of walking yields more than once a month an hour of running.

An underestimated form of calorie burning is NEAT - Non-Exercise Activity Thermogenesis. This is all movement that isn't sport: climbing stairs, standing, talking with your hands, grocery shopping. NEAT can make up 200 to 500 kcal per day. A simple tip: set a step counter and aim for 8,000 to 10,000 steps per day.

Sleep: the forgotten factor

Too little sleep makes losing weight significantly harder. Research shows that sleep deprivation leads to more hunger hormones (ghrelin rises), fewer satiety hormones (leptin drops), more craving for calorie-rich food, and less willpower to make healthy choices.

Moreover, research confirms that people who sleep less than 7 hours during a calorie deficit lose more muscle mass and less fat than people who get enough sleep. Aim for 7 to 9 hours of sleep per night.

Stress and cortisol

Chronic stress increases your cortisol levels. Cortisol promotes fat storage, especially around your belly, and it increases your appetite. When you're stressed, chances are you eat more, make poorer choices, and have less energy to train.

Stress management is not a luxury - it is part of your weight loss strategy. Meditation, walking in nature, breathing exercises, or just a hobby that relaxes you. Find something that works for you.

Plateaus: when weight stalls

After a few weeks of losing weight, it can happen that the scale no longer moves. This is normal and it doesn't mean you're doing something wrong. There are a few reasons why weight can stagnate:

• Water retention: your body holds more water, especially with more carbohydrates, salt, or after a heavy training.
• Metabolic adaptation: your body burns slightly fewer calories than before because you have become lighter.
• Calorie creep: you unconsciously eat slightly more than you think. Portion sizes grow as you become less strict.

The solution: be patient. Look at the average weight over 2-3 weeks, not daily fluctuations. Are you really stalled after 3 weeks? Lower your calorie intake by 100-200 kcal, or add some extra movement. No drastic interventions needed.

Alcohol and weight loss

Alcohol contains 7 kcal per gram - almost as much as fat. Two glasses of wine are quickly 250 kcal. But the problem goes beyond the calories: alcohol inhibits fat burning, disrupts your sleep, lowers your inhibitions (hello, bar snacks), and burdens your liver.

This doesn't mean you can never drink again. But be aware of the impact. A few drinks on Friday evening can halve your weekly result. Choose less calorie-rich options (gin and tonic instead of beer), or drink less often.

The five myths of weight loss

1. "You must eat 6 small meals per day to keep your metabolism going." Not true. It doesn't matter whether you eat 2 or 6 times a day. Your total calorie intake determines whether you lose weight, not the frequency.
2. "Carbohydrates make you fat." No. An excess of calories makes you fat, regardless of the source. Carbohydrates are your most important fuel for training.
3. "Fat burning only starts after 20 minutes." Nonsense. You burn fat from the first moment. The ratio shifts, but the total is what counts.
4. "Muscle tissue weighs more than fat." A kilo is a kilo. Muscle tissue is more compact than fat tissue, so it takes up less space at the same weight.
5. "Supplements help with weight loss." The vast majority of weight loss supplements have no proven effect. Save your money and invest it in good nutrition.

The pace: how many kilos per week?

A healthy weight loss pace is 0.5 to 1 kilo per week for most people. If you have a lot of overweight (BMI above 30), it can go faster in the beginning - 1 to 1.5 kilos per week is still responsible then.

Losing weight faster than 1 kilo per week is unwise for most people. The risk of muscle loss increases, your energy level drops, and the chance of relapse rises. Helms et al. (2014) even advise bodybuilders to lose no more than 0.5-1% of their body weight per week - and they have great motivation to get lean.

Summary: your weight loss checklist

• Calculate your TDEE and eat 300-500 kcal less per day
• Eat 1.8-2.2 grams of protein per kilo of body weight
• Train 2-3x per week with weights
• Move more in your daily life (8,000-10,000 steps)
• Sleep 7-9 hours per night
• Limit alcohol
• Be patient and consistent
• Recalculate every 4-6 weeks

Weight loss is not a sprint, it is a marathon. The people who achieve the best results are not those who diet the hardest, but those who sustain it the longest. Choose an approach that fits your life, and give it time.