Other things could accept this, but the most likely culprit is a higher fat (or much higher protein) meal than usual.
Fat (and protein, to a lesser extent) slows down the absorption of carbs. If I eat pizza and give myself the correct amount of insulin for the carbs, I often go LOW by the two-hour mark, but then I'll go HIGH by the three or four hours after, it's high!
The worst things for leptin and insulin are eating between meals, eating large meals, eating low fiber, eating high refined sugar or refined carbohydrates, not eating enough quality protein, and not exercising.
If you eat anything after dinner you make matters even worse, because now you reduce the optimal access into your stored fat during sleep, a prime opportunity to burn fat.
When this system is abused and weight is gained, then fat begins to accumulate in excess in your liver. The fat clogs your liverâ€™s metabolism and reduces the ability of sugar to store in your liver following a meal. This is liver insulin resistance caused by fatty build up. This means that you are much more likely to become hypoglycemic or low blood sugar between meals â€“ as you donâ€™t have enough sugar in your warehouse to use for blood sugar between meals.
This same fatty liver problem also gets in the way of how glucagon would burn fat between meals, causing glucagon to synthesize sugar in an inappropriate and out-of-control manner, making blood sugar go high even though you havenâ€™t eaten. This is why diabetics wake up with very high fasting blood sugar levels. These are complicated metabolic problems that are more difficult to fix than simple case insulin resistance.
Furthermore, your pancreas starts to tune out leptin, meaning that leptin resistance is occurring at the level of beta cells and the beta cells arenâ€™t getting the leptin message to stop making insulin in a timely manner. This causes extra insulin to be made, which excessively lowers blood sugar by turning sugar to fat, while simultaneously inducing hypoglycemia or low blood sugar symptoms. This makes a person want to eat again two to three hours after the previous meal, in turn making the whole problem worse.
And itâ€™s about this time, with metabolism clogged and broken, that a young overweight person goes to the doctor and finds out he or she is type II diabetic.
Avoid eating after dinner, because your body needs as much time as possible to break down the food consumed that day. If you haven't consumed enough calories, your body will begin breaking down fat reserves to supply the additional fuel.
It is also important to eat smaller portions, even if you are only eating three times per day. Chew thoroughly and eat slowly so that your body has time to recognize that it is full. The fewer calories you consume, the more weight you will lose.
Other strategies for minimizing leptin release are to eat protein with each meal, especially breakfast, and to reduce--not eliminate--carbohydrates.
The best food to reduce leptin levels is fish.
Hope this helps.