The difference is that eating once a day means a very plentiful, dense, as they say, meal.
Splitting your daily food intake several times (at least 3 times) will unload you, your body and your stomach in particular.
Imagine a transparent bowl. Soup is poured into it in turn after a fairly short period of time, then chopped pieces of bread, salad, tamp everything on top, for example, potatoes with meat, and then another , for a complete picture, pour compote.
Moreover, all this "mixture" is crushed, mixed ...
If you imagine this, then you will hardly have a desire to taste such an unusual "food". And the stomach digests all this.
Speaking in human terms, the mash after a one-time meal will be quite difficult to digest (splitting, decomposition of food under the influence of gastric juice), since the presence of various refectory feasts will greatly complicate everything.
Separately, it is necessary to mention the fact that the "mash" will be much worse absorbed, since it will be difficult for the stomach to "sort" useful substances and microelements from each other in this confusion of dishes.
One meal - this is "Hello, gastritis. Hello, obesity. I haven't seen you for a long time, heaviness in the stomach!"
If I understand correctly, I mean, what is the difference between the consumption of the daily value of food in one sitting and breaking it several times during the day. Then the difference is in the load on the gastrointestinal tract, and especially on the pancreas. In addition to the obvious bloating and the accompanying discomfort, regular consumption of food in large portions (even if it does not contain fat and sugar) has a detrimental effect on the pancreas up to the appearance of serious diseases like chronic pancreatitis. Based on this, it is advisable to divide the daily food intake into at least 3-4 meals.