The aim of this rct -study is to explore the effect of a dietary intervention for overweight (body maas index BMI≥25) and obese (BMI≥30) pregnant women on gestational weight gain and the prevalence of gestational diabetes.

Pregnant women are recruited for the study from 18 maternity care clinics in Northern Savo and Northern Karelia area. The participants will be randomized into intervention and control groups. All the participants will have access to the study web-pages, which includes written material of healthy diet during pregnancy as well as all the study material (4 day food records, Three factor eating questionnaire (TFEQ R-18) and Binge Eating Scale (BES)). In addition, intervention group will get two virtual dietary counseling sessions by a dietician. The information on participants' gestational weight gain and the result of oral glucose tolerance tests will be collected by the public health nurses after birth.

Inclusion Criteria:

• BMI 25 or higher
• healthy, no chronic medical conditions that can prevent participating to the study
• singleton pregnancy
• first trimester of pregnancy at the time of recruitment

Exclusion Criteria:

• BMI less than 25
• chronic medical conditions
• multiple pregnancy
• pregnancy at second or third trimester at the time of recruitment

Females because of pregnancy