How to Lose 5kg in a Week – The Best Diet Plan Ever

Can You Lose 5kg in a Week? Here’s the Honest Answer

5 kilograms in 7 days is about 11 pounds. The short version: you can get that number off the scale, but almost none of it is fat, and most of it comes back the moment you eat a normal meal again.

The Mayo Clinic puts the safe rate at 1 to 2 pounds a week. That’s 1 to 2 kilograms. Everything beyond that is water, glycogen, and — if you’re not careful — muscle.

What “Losing 5kg in a Week” Actually Looks Like

It means eating very few calories for seven straight days and drinking a lot of water, which depletes your glycogen stores. Every gram of glycogen holds about three grams of water. When glycogen drops, that water goes with it, and the scale drops fast. It’s real weight, but it’s not fat.

Once you start eating carbohydrates again, glycogen refills and the water returns. Often within 48 hours. That’s the trap: the number looked like progress, but nothing structural changed.

Breakfast Matters More Than People Think

Skipping breakfast is one of the most common mistakes in a week like this. “It starts your metabolism” is a simplified version of what’s actually happening, but consistent eating patterns do keep blood sugar stable, which keeps hunger hormones in check and reduces the afternoon cravings that blow up most crash weeks.

Aim for protein at breakfast — eggs, Greek yogurt, or a protein shake — and you’ll be far less likely to hit the vending machine at 3pm.

Meal Replacements: Useful, but Not Magic

Many “5kg in a week” plans lean on meal replacement shakes. Harvard’s Nutrition Source notes that meal replacements can help with calorie control when used strategically — a shake instead of a fast-food lunch is an easy calorie save. But whole foods should stay the foundation. A week built entirely on shakes is hard to sustain and usually leaves you feeling flat.

If you do use a shake as a meal replacement, choose one with real protein (20g+) and low added sugar. Pair it with actual vegetables so you’re not running on nothing but powder.

A daily greens blend can also help bridge the micronutrient gap when meals get simple and repetitive. Purium’s More Greens adds vitamins, minerals, and antioxidants without meaningful calories — useful when you’re eating less than usual.

Cut Sugar. This Part Is Genuinely Good Advice.

If you take one thing from the original article, make it this: eliminate added sugar. Harvard’s research on added sugars links high intake directly to weight gain, and it’s the easiest calorie reduction most people can make. Soda, candy, sauces, “healthy” bars — all of it adds up. Drop sugar and you’re probably down 300–500 calories a day without touching anything else.

5 Liters of Water a Day? Be Careful.

The original plan recommends 5L per day. That’s a lot — and for most people, unnecessary. The CDC’s guidance puts total fluid intake at roughly 3.7 liters for men and 2.7 liters for women, including water from food. Pushing past 4–5L of plain water can dilute sodium to dangerous levels in extreme cases. Drink to thirst, aim for pale yellow urine, and don’t treat the bottle as a quota.

After the Week Is Done

Here’s the part most plans skip: what happens on day 8. The water weight returns. Hunger spikes. Without a transition plan, the crash week becomes a yo-yo cycle rather than a reset.

If you want the weight loss to actually stick, use the crash week as a starting point, not the whole strategy. From there, move into a sustainable plan. Our How to Lose 5 Pounds in a Week article covers a more realistic version of the same idea, and the 3 Healthy Tips to Lose Weight Fast in 60 Days or Less guide walks through the 2-month approach that actually holds.

For the longer game, the How to Lose 10kg in 3 Months plan is the one that gets people past the rebound phase and into real fat loss.

Sleep and Stress Are the Hidden Saboteurs

During a low-calorie week, stress and poor sleep make everything worse. Poor sleep raises ghrelin and lowers leptin, so you wake up hungrier. Chronic stress keeps cortisol elevated, which encourages the body to hold onto fat. If stress is stealing your sleep, look at When Stress Steals Your Sleep — and How to Get It Back before you start the week.

Protect seven to eight hours. Keep your schedule consistent. The crash week works worse without sleep than it does with it.

The Bottom Line

You can lose 5kg on the scale in a week. Most of it is water. Some is glycogen. Very little is fat. If you use that week as a reset — cut sugar, protect breakfast, keep exercise going, fix your sleep — it can be the start of a real, lasting change. If you treat it as the whole plan, the number comes back by next weekend and you’re in the same place.

The people who succeed treat the week as a signal, not a destination.

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