13-Day Diet That Helps You Lose Up To 40 Pounds

This 13-day diet is hard, but effective, to burn off fat. After 13 days you can eat normally without putting on weight for 2 years. It is also known as The Danish Diet or The Copenhagen Diet.

This is not a traditional diet where you gain the weight back at the end of the fasting period. Instead, the 13-day diet will increase your metabolism and you will maintain your weight after the diet is finished.

Just don’t freak out if in the first week after the diet you may put on a little weight. This will regulate after a while.

If you follow the 13-day diet, you will lose all excess fat, between 15 – 40 pounds (7 – 20 kg)!

The diet must be followed for 13 days. No more, no less. That’s because the 13-day diet is an extremely low caloric diet with an intake of approximately 600 calories per day.

Because this diet is unbalanced, lacking in dairy, whole grains and fruits, you may experience vitamin and mineral deficiencies and tiredness. You’ll also feel hungry all the time and your body will be more receptive to illness.

13-Day Diet

Image created by Florin Nita

The 13-Day Diet Rules

Here are some rules you need to follow with this diet:

  1. If during the diet you drink beer or whine, eat sweets or chewing gum, or any extra food, then you must stop immediately, or it will not work at all. All the hard work up until then will nullify itself in your body chemistry.
  2. If you brake this diet, you cannot start again for 6 months.
  3. If you follow it step by step over 13 days, you CANNOT follow this diet again for another two years (because of the shake-up to your metabolism).
  4. Throughout this diet you may supplement beef/salmon/lamb with 250g of chicken breast.
  5. Also, you may use garlic, oregano or any other pepper, seasoning, but NO SALT on this diet.
  6. After 13 days you can eat normally, but recommended one or two days a week of sensible eating.
  7. Avoid any intense physical activity, because of the extremely low calorie intake.

The 13-Day Diet Menu

Here is the entire eating plan for 13 days. Follow it strictly if you want to lose more than 15 pounds in 2 weeks!

13-Day Diet Plan (The Danish Diet)

Image created by Florin Nita

Now remember, the 13-day diet is a metabolic diet, do not go and mess up all good you have just done. Eat sensibly and healthy!

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What can we substitute in place as Meat as some of us are Vegetarians. I do have dairy though!


We have to choose one of the options in each meal ? and can i eat chicken instead of beef?


I just started the 13-day diet, finished day 2 going onto 3. I haven’t seen a drop on the scale yet, hopefully it’ll be a different story tmrw morning.

Poncho Kaziragi

How much water you can drink during the diet?

Martha Swords

What size spoon of sugar?? 1spoon?

Amiya Whitson

How do you make the lemon dressing

Amiya Whitson

Are there any snacks that we can eat throughout the day


There is a comment ‘Very NB must be taken’, what is NB?


Hi I started the diet today and I added salt to my beef, Will you advise I stop or I can continue the diet making sure I don’t use salt again


I can’t eat hard boiled eggs. Can I do scrambled instead or the liquid eggs?


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