Here are the suggested words from the box to complete the passage:

21. **important**
22. **health**
23. **unable**
24. **lose**
25. **skipping**

So the completed passage would read:

"Breakfast is the most **important** meal of the day. It provides the nutrients your body needs for good **health**, the calories it needs for energy and helps to maintain your sugar blood level. Studies have shown that people who don’t have breakfast have a low blood sugar level and are often slow, tired, hungry and **unable** to concentrate. Surprisingly breakfast actually plays a part in weight control. It’s easier to **lose** weight if you eat in the morning rather than later in the day. Dividing the day’s calories into three meals helps take off weight more efficiently than **skipping** a breakfast and having two larger meals a day does."