What the meaning of this phrase "I just love you too much to let you eat that (pizza)"? [closed]

The assumption here is that eating the pizza would be bad (I suppose for health reasons) and therefore the right thing for a caring person to do would be to try and dissuade the person from eating it. It is like a parent might prevent their child from eating too many sweets.

From a syntax point of view, I love you too much to let is always followed by the thing that you don't want to happen. The word let means allow in this context. So you are already saying that you don't want to allow the thing to happen. Therefore, another negative is not required.

It is an idiomatic expression, so much so that it can sometimes be said as a joke (although it is obviously serious in this case).

As a joke, the speaker actually wants to eat the pizza themselves (or at least share it) and pretends to want to prevent the other from eating it because they care about them. Both people have to understand this for the joke to be funny.

The word "too" by itself means "more than enough" or "excessively much." The construction "too [verb] [to-infinitive]" means "so much that something cannot happen" (Cambridge).

From an analytical perspective, it's implied that there is a limit up to which something could happen, but the instance being referred to is beyond that limit (hence "too" much).

For example, say there is a certain amount of weight that I am able to lift. If I am referring to a weight that is greater than that limit, I would say, "This weight is too heavy to lift." The negative is implied in the construction, i.e. "This weight is so heavy that I cannot lift it." Alternatively, "This weight is too heavy [for it to be possible] to lift."

In the video, "I love you too much to let you eat that" means "I love you so much that I cannot let you eat that."