You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was the system of measuring calories invented?" whose answer is 1780.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was calorie counting introduced for weight loss
Useful Output:

Doc 1: Calorie counting has long been ingrained in the prevailing nutrition and weight loss advice. The Centers for Disease Control and Prevention
Doc 2: While counting calories can help you lose weight in the short term, it typically leads to failure in the long run, Robert J. Davis writes.
Doc 3: The French physicist Nicolas Clément introduced the concept of calories while giving lectures about heat engines in Paris in 1819. The first use
Doc 4: Low calorie meals for weight loss as well as just the term “low calorie” as a dietary concept emerged in the early 20th century,
Doc 5: The “calories in, calories out” formula for weight loss success is a myth because it oversimplifies the complex process of calculating energy intake and