When your body is deprived of food or carbohydrate intake is drastically reduced, your body starts using fat, turned into ketones, as fuel. This state of elevated ketones is called 'ketosis.' People who are losing body fat, fasting, or not consuming low-calorie diets will regularly dip into this ketogenic state.
However, it is important to note that the body can use both stored body fat and fat from our foods to produce ketones that can be shown by blood, breath, or urine ketone readings. When the goal is fat loss, this is done by primarily burning stored body fat rather than fat from our diet. In other words, blood, urine, or breath ketone readings do not indicate body fat loss, and higher readings may be confounded or misleading. In many cases, people may even be gaining weight on higher ketone readings!
The best way to lose fat is to eat at a caloric deficit to favor the body fat that you desire and can sustain. The focus should be on high-quality foods and not ketone readings from either blood, urine, or breath analyzers. Most people, save for those fighting very specific conditions, do not need to be in extended periods of ketosis or purposely and artificially, by exogenous ketone supplements, elevate their ketone readings.
For most people, a regular low-carbohydrate diet that has high-quality structurally rich foods and reduced amounts of free fats, free carbohydrates, and free proteins will be one of the best ways to lose fat. The goal should be a sustainable lifestyle with tasty and convenient foods that you enjoy and give you results, not padding misleading numbers.
This was the reason why we don't tell most consumers of Energy Pods to worry about ketone readings or even worry about being in ketosis.