Celery is an undervalued vegetable. It is loaded with nutrients and contains almost no calories – one large stalk has maybe 10 calories. Celery is great because it can lower your blood pressure, 100g contains about 8% of your RDI of vitamin A (great for your eye health), it aids in digestion because it’s high in insoluble fibre, and it even lowers your LDL (bad cholesterol).