Changes her cooking style to a healthier one

Maria's online friends have been discussing that they've changed into healthier cooking styles and that this had a positive impact on their health. She decides to give it a try and replaces butter and processed oils with vegetable or plant based oils for cooking. Her expectations are way too high and is eager to see some results with body weight. 

Unfortunately, apart from her improved cholesterol levels, her body weight has not improved significantly so she feels frustrated with her progress and is now wondering what other options she has. 

One idea is to visit a nutritioninst. Probably a little professional help could do what she cannot do on her own. Another idea is to just give up. Whatever she has been trying to do, does not seem to be working. She feels a bit demotivated.