To the simplest question: why exactly 18:00, why not 17:50 or 19:00? – no one knows the answer. The rule is stereotypical, and appeared thanks to the imagination of nutritionists of the 80s of the last century. This rule has no scientific evidence base, as evidenced by the illogicality and the lack of any arguments.
The rule of not eating after 6 pm was created by American nutritionists. The task was simple – it was necessary to reduce the consumption of calories per capita, but to do it unobtrusively. All sorts of false statements appeared, according to which gastric juice and the gastrointestinal tract begin to work poorly in the evening. The blame was placed on the biological clock and rhythms of a person.
But the rule was not invented just like that, which means there is potential benefit, and this should be discussed in detail.
Losing weight is a calorie deficit
Your task is to create an energy deficit, either through training or nutrition. The most effective method is to reduce your diet. The rule "don't eat after 6:00 PM" significantly reduces the daily caloric intake, which means a deficit and corresponding weight loss.
Often this rule leads to skipping a full dinner. That is, you exclude a normal meal from your diet. Calories become less, but will this method help you lose weight?
Unfortunately, skipping any meal will not give you the desired result. This throws the body out of its usual schedule, and it will simply compensate the next day for everything that you did not give it at breakfast or lunch. In theory, this way you will cut your diet by 1/3, but in practice, you will make it worse. The body is a unique balanced system that will get what it wants, and in our case, energy from food, if not today, then tomorrow, and it has enough “levers of pressure” on you, starting with an increase in appetite and ending with low physical activity.
Why can't you eat after 6?
If we exclude what is written above, then in addition to this, a significant argument can be the statistics of breakdowns. Most often, people break down in the evening, and eat the missing calories. If you do not eat in the evening and go to bed early, you will most likely protect yourself from breakdowns, but on a regular basis, this method will not work.
There is a review of studies conducted over the past 40 years. They tested various nutrition plans, intuitive eating methods, food refusals and much more. What is the conclusion? - manipulations with food refusal or various games with snacks do not give a long-term result in weight loss. If they help, then only at the beginning.
What is noteworthy is that the more a person weighs, the more aggressively the body will react to such "bayonets" from your side. For example, if a fat person refuses breakfast, his body will force him to eat more food during the rest of the day than he would have received with breakfast. Of course, we are talking about eating food without counting calories - intuitively. Therefore, the rule "do not eat after 6 pm" is often considered as a supplement to the intuitive diet.
How to apply the rule in practice
Despite the small benefit of prohibiting food after 6 pm, an experienced dieter can use it, but under certain conditions. Change the rule: you can’t eat sweets after 6 pm, or you can’t eat anything except cottage cheese/kefir/milk after 6 pm, etc. Start from your individual habits and weaknesses.
Your task is to minimize the risk of breakdowns in the evening. If sweets are the object of "irritation" for you, then forbid yourself from eating them after 6 p.m., but do not forbid them at all, otherwise you will come closer to a breakdown. Many people who are losing weight are helped by this rule in the format: "You can't eat anything except healthy food after 6 p.m." You will not get many calories from buckwheat, chicken breast or vegetables, and at the same time you will easily suppress your appetite, which will reduce the risk of breakdowns on the diet.
Resources:
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