It can be worrying when los go on food strike, but I really think that they'll be ok, as Laura has posted, it does happen to many babies when they're teething or poorly in any way, or if they're distracted by something more interesting, or too tired to eat.
But also, at 8 months and even older, milk remains the single most important food a baby can have, with solid foods topping them up with nutrients and to stave off hunger, and it's important to trust your babies' instincts when it comes to appetite, they don't tend to starve themselves, it goes against their innate survival mechanisms, so if they don't want it, ok! as long as they're getting their milk!
I'll also second the suggestion to check out the baby-led weaning threads, and the finger foods for young babies thread in the Recipes section, for ideas about how and what to offer these stubborn los when they refuse the spoon!
Ax