That's a completely different thing.
Honey, for instance, has a high glycemic index. Watermelon has a high glycemic index. They will not get you fat the same way cane sugar and watermelon juice will.
A juice made of celery, kale, and spinach, will still have a low glycemic index. But it's still nowhere near as good for you as unprocessed celery, kale, and spinach.
>Honey, for instance, has a high glycemic index. Watermelon has a high glycemic index. They will not get you fat the same way cane sugar and watermelon juice will.
Aside from not being evidenced, this is irrelevant to your hypothesis. Watermelon contains little fiber even on a per-calorie basis (https://tools.myfooddata.com/nutrition-facts/167765/wt1) and honey (https://www.nutritionvalue.org/Honey_nutritional_value.html) contains almost none.