The present invention relates to oligomer compounds (oligomers), which target mtGPAT1mRNA in a cell, leading to reduced expression of mtGPAT1. Reduction of mtGPAT1 expression is beneficial for the treatment of certain medical disorders, such as overweight, obesity, fatty liver, hepatosteatosis, non alcoholic fatty liver disease (NAFLD), non alcoholic steatohepatitis (NASH), insulin resistance, and non insulin dependent diabetes mellitus (NIDDM).