Reducing carbs reduces the subsequent blood sugar spike, which reduces the insulin the pancreas must produce to push that sugar into the fat cells, increasing w

Reducing carbs reduces the subsequent blood sugar spike, which reduces the insulin the pancreas must produce to push that sugar into the fat cells, increasing weight, and eliminating the subsequent sugar crash which causes you to feel hungry. On a keto diet, instead of being hungry 2 hours after eating, you won't be hungry until 6 hours later. This reduces calories eaten which helps reduce weight.