This also causes your body to transition into ketosis, a metabolic state in which your body uses fat as its primary source of energy ( 9). This results in the production of ketone bodies, a type of compound produced when your body converts fat into fuel ( 8). The fasting state lasts from about 18 hours to 2 days of fasting.īy this point, your glycogen stores in the liver have been depleted, and your body begins breaking down protein and fat stores for energy instead. summaryĪ few hours after eating, your body transitions into the early fasting state, which occurs when glycogen, amino acids, and fatty acids are converted into energy. Many common forms of intermittent fasting, such as the 16/8 method, cycle between the fed state and early fasting state.
Your body also converts amino acids, which are the building blocks of proteins, into energy. This intensifies lipolysis, a process in which triglycerides from fat cells are broken down into smaller molecules that can be used as an alternative source of fuel ( 7). Toward the end of this phase, your body will slowly run out of liver glycogen stores and start searching for another energy source. During this state, your blood sugar and insulin levels increase, while levels of other hormones, including leptin and ghrelin, shift.Īround 3–4 hours after eating, your body transitions into the early fasting state, which lasts until around 18 hours after eating.ĭuring this phase, your blood sugar and insulin levels start to decline, causing your body to start converting glycogen into glucose (sugar) to use as energy ( 1). The fed state occurs within the first few hours after eating. Note that the fed-fast cycle resets back to the fed state as soon as food is consumed during a fast.Īlso, the size and composition of your meal affect how long your body remains in the fed state.
Meanwhile, leptin, which has an appetite-suppressing effect, increased after eating ( 4, 5, 6). Ghrelin is a type of hormone that stimulates hunger, and its levels decrease after you eat. Glycogen is your body’s primary form of stored carbs, and it can be converted back into sugar as a source of energy as needed ( 3).ĭuring this time, levels of other hormones, including leptin and ghrelin, also shift.
The amount of insulin released depends on the composition of your meal, the amount of carbs consumed, and how sensitive your body is to insulin ( 2).Įxtra glucose (sugar) is stored in the liver and muscles as glycogen. Insulin is the hormone responsible for transporting sugar from your bloodstream into your cells ( 1). The fed state occurs within the first few hours after eating as your body digests and absorbs nutrients from food.ĭuring this period, your blood sugar levels increase and higher amounts of insulin are secreted.
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