There are a few that appear to be mildly effective. This includes Caffeine, Green Tea and Glucomannan (a fiber that can reduce appetite). However, the results are usually weak and inconsistent and certainly nothing to get excited about.
Inductive, or "bottom-up," research, by comparison, collects data and observations in order to discern a pattern within them, or to formulate a new theory. The procedure followed by deductive research can be summarized as follows: Theory, starting with existing knowledge or assumptions.
A deductive approach is concerned with “developing a hypothesis (or hypotheses) based on existing theory, and then designing a research strategy to test the hypothesis” It has been stated that “deductive means reasoning from the particular to the general. If a causal relationship or link.
In logic, we often refer to the two broad methods of reasoning as the deductive and inductive approaches. Deductive reasoning works from the more general to the more specific. Sometimes this is informally called a "top-down" approach. The main difference between inductive and deductive approaches to research is that whilst a deductive approach is aimed and testing theory, an inductive approach is concerned with the generation of new theory emerging from the data.
Deductive definition is - of, relating to, or provable by deriving conclusions by reasoning: of, relating to, or provable by deduction. but resisted what seemed to them the blinkered reliance on deductive reasoning and empirical research enforced by encroaching science.