  In short, the Okinawans circa 1950 ate sweet potatoes for  of the of food that they consumed, which constituted 69\% of their total calories.
<fluency>   In short, the Okinawans circa 1950 ate sweet potatoes for  of the of food that they consumed, which constituted 69\% of their total calories.
 . In short, the Okinawans circa 1950 ate sweet potatoes for of the of food that they consumed, which constituted 69\% of their total calories.