That is making a generalization of everyone that says they have candida. What about people who have yeast when they use the bathroom?
How about people with parasites
that makes their body hard to absorb food or nutrients?
That is generalizing a lot to say simply that everyone with candida is simply not eating enough calories. If I eat too much food I become bloated, if I eat not too much it helps my body to detox. There is a reason many people with parasites
and who have taken Antibiotics
for other diseases come down with yeast in their body whether through their stool or otherwise.
Imagine someone takes Antibiotics
for a few months and starts having mushy stools even when they eat a lot and healthy food too, are you going to tell them that candida doesn't exist? It still doesn't make sense to say that it just doesn't exist if it isn't in vagina, or oral thrush.
Sure malnutrition plays a role but if someone has candida or parasites
that rob someone's nutrition it could get a little more complicated than simply eating more food.