Answer: Elderberries are not keto, as they contain an enormous amount of carbs.
Each serving of elderberries (1 cup) contains 16.5 g of net carbs. Sadly, that's far too carb-heavy to fit the keto diet.
Unfortunately, only a few fruits have a low enough carb count to fit the keto diet. If you're dying for some fruit, berries tend to be your best bet. Here are a few keto-friendly options:
Although it may not spring to mind when you think "fruit," avocados are the most keto-friendly fruit you can find. They're high in healthy fats and have a low carb profile, making them ideal for keto.