The part after WHERE decides which columns are searched.
So you need to change it this way:
$foods = $wpdb->get_results(
$wpdb->prepare(
"SELECT id, foodname, namevariations, calories, carbs, fat, protein, sodium FROM foodsTable WHERE namevariations like %1$s OR foodname like %1$s",
'%' . $wpdb->esc_like( $search_text ) . '%'
),
ARRAY_A
);
Also you were using LIKE queries incorrectly. If the $search_text contained % character, it would be interpreted as wildcard and not as simple character. That’s why I’ve added some escaping in your code. More on this topic here: How do you properly prepare a %LIKE% SQL statement?
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