According to an American study conducted on a group of 91 overweight people, weighing yourself every day would promote weight loss for those on a diet: it seems that half of the overweight people examined, or those who managed to weigh every day, lost six extra pounds on a six-month diet compared to those who weighed themselves twice a week or once a week.
In fact, the scale can be a useful, very useful or harmful tool for losing weight.
The scale can also make you fat, and a lot depends on the type of people you are going to analyze: this is why you will find many dieticians who recommend weighing yourself once a week, and studies that confirm this. The sample of this study, carried out in 2013 by Dori Steinberg of the Duke Global Health Institute, is in my opinion too modest and not very indicative to draw the right conclusions. Another study, published in the journal Plos One in recent months (from 2015), establishes on the contrary that you need to weigh yourself once a week. Who is right?

I recommend figuring out when to weigh yourself based on how much you know each other. If we are anxious and easy to demotivate people, the fluctuations in daily weight, typical in every individual and more typical in women, will make us give up the diet before obtaining the real results. In fact, some people lose weight more slowly than others: weight loss is not a linear process, so weighing oneself every day for some is emotional and makes you think you can never lose weight.
For other people, checking their weight every day encourages them to continue the diet  and in this case weighing themselves every day is like having a coach shouting in our ears that we are good or that we need to do more depending on the results. Unfortunately this is a minority.
Finally, those with control freaks use the scales as a weapon and not in an appropriate way, for example tending to weigh themselves more than once a day and ending up being stressed about weight and fatally gaining weight instead of losing weight : for these people it would be appropriate to weigh yourself even once a month and prefer the mirror of the house as a yardstick.

According to Ari Whitten, nutritionist and personal trainer, most people develop a counterproductive relationship with the scale. Ari Whitten says:“The decisions that are made based on the weight we measure are almost always counterproductive (…) people who often measure themselves on the scales become statistically fatter”. How is it possible? People confuse pounds with fat. If they gain weight, perhaps by working out (or starting to eat better) is always bad news. If they lose weight, perhaps with a diet that will then make them fatter by affecting their metabolism, that’s always good news. What they eat, what they drink, it’s all aimed at that number. And at first the trick succeeds. Any fast diet makes us lose fluids immediately and allows us to lose weight in 3-4 days. But then, people experience the “crazy balance effect”: the scales keep going up, whatever they do they gain weight.
Unfortunately, I have often experienced this side effect of the scale and for me the only way to always stay in shape is not to measure myself on the scale.

In short, the scale can demotivate us, motivate us or pester us as the case may be. This is why it is good to understand what types we are: just as there is a diet for us, the use of weight control tools must also be personalized. The result is not only losing more weight, but also not losing your mind.