First Research Study to Look at How Two Medicines, NNC0480-0389 and Semaglutide, Work Together in Healthy People, in People With High Body Weight and in People With Diabetes

Part 1: A single dose of NNC0480-0389, dose increased in each cohort. Part 2: Weekly doses (for 4 weeks) of NNC0480-0389, dose increased in each cohort.

Part 1: Single dose of semaglutide (0.5 mg). Part 2: Weekly doses of semaglutide alone for 8 weeks (2 x 0.25 mg, 2 x 0.5 mg and 4 x 1 mg) followed by weekly fixed doses of 1 mg semaglutide for 4 weeks.

Placebo for NNC0480-0389. Part 1: A single dose of placebo (NNC0480-0389), dose increased in each cohort. Part 2: Weekly doses (for 4 weeks) of placebo A, dose increased in each cohort.

Part 1: Single dose of placebo (semaglutide) (0.5 mg). Part 2: Weekly doses of placebo (semaglutide) alone for 8 weeks (2 x 0.25 mg, 2 x 0.5 mg and 4 x 1 mg) followed by weekly fixed doses of 1 mg semaglutide for 4 weeks.