[stronglikedan]

Considering that a healthy belly is filled by approximately two fists worth of food, two slices will always fill a healthy belly. And it doesn't have to be well rounded to be healthy, just devoid of processed foods and limited to a healthy portion (see two fists rule above). Of course, YMMV if you're not a particularly healthy person to begin with.

[simplify]

Also note that not being "a healthy person" may not be your fault. Some people's digestive systems weaken over time, causing them to often feel less full when eating (and thus eat more without realizing it).