Final answer:
The statement is false; habichuelas are part of Puerto Rican cuisine while 'to stones' seems to be a confusion with 'tostones,' which are fried plantains. Digestive upsets can occur when changing diets due to the need for the body to adjust to different foods and microbes.
Step-by-step explanation:
The statement that Habichuelas and to stones are two typical dishes of Puerto Rico is False. While habichuelas, which are beans, are indeed a staple of Puerto Rican cuisine, the reference to 'to stones' seems to be a typo or confusion. In Puerto Rico, a common dish is 'tostones,' which are twice-fried plantain slices. The mention of stones in the context provided refers to tools used to grind corn, which is not a dish but a method used in food preparation, common in Mexico for making tortillas.
As for digestive upsets when changing diets, the human body becomes accustomed to a certain microbiome and enzymes that aid in the digestion of the usual foods in one's diet. When a person moves to a different region or country and starts consuming different foods, it may take time for their digestive system to adjust to the new food types, preparation methods, and bacterial flora, leading to temporary digestive upsets.