For even a very young Malinois puppy, biting is a deeply self-rewarding behavior, and food is not a higher calling.
How do you stop a deeply self-rewarding behavior if you have no higher reward, and are not willing to use the P-word? Too many have no idea. They can prattle on about clickers and rewards (all good) but too many have never really paid attention to what a Skinner box looks like, nor are they aware of the limits of what Skinner did in terms of type of animal and location.
If the only trick you have in your box is a clicker and a food bag, you can do a great deal of dog training, but you are not going to be a dog trainer.