Table 2.

Overview of data collection

	T0	T1	T2	T3	T4	T5	T6	T7	T8	T9							T10	T11
											D4	W1	W2	W3	W4	W5	W6
Researcher
Anthropometrics		X	X	X	X	X	X	X	X	X							X	X
Bariatric surgery	X	X	X	X	X	X
Co-morbidities & medication		X	X	X	X	X	X	X	X								X	X
Blood analysis		X		X	X	X	X	X		X							X
Pregnancy							X	X	X	X
Participant
Medical & obstetric history	X
Demographics	X
Lifestyle habits		X			X	X	X	X	X									X
Physical activity		X			X	X	X	X	X		X						X	X
Food Frequency Questionnaire									X		X						X
3-day food record – dietary supplements		X			X	X	X	X	X									X
Depression							X		X								X	X
Anxiety		X			X	X	X		X								X	X
Quality of life		X			X	X	X		X									X
Intention of becoming pregnant	Xa
Menstrual cycle, contraception, sexuality		X			X	X
Breastfeeding																		X
Milk sample											X	X	X	X	X	X	X

Abbreviations: T0 baseline, T1 before surgery, T2 3 weeks after surgery, T3 3 months after surgery, T4 6 months after surgery, T5 12 or X months after surgery, T6 1^st trimester of pregnancy, T7 2^nd trimester of pregnancy, T8 3^rd trimester of pregnancy, T9 birth, T10 6–8 weeks postpartum, T11 6 months postpartum, D4 day 4 postpartum, W 1, 2, 3, 4, 5, 6 weeks postpartum

^ainclusion pre- and postoperatively