Yeah, weight does that. When I decided to lose a bunch of weight (successfully), I found that it wasn't a good idea to weigh myself every day. Leads to discouragement because you could be really loyal to your diet/exercise plan for a day and still gain weight for no explainable reason. Better method is doing it every week or every two weeks. Which one of these seems simpler and less stressful?
Day 1: 200.0
Day 2: 199.5
Day 3: 200.0
Day 4: 199.0
Day 5: 199.5
Day 6: 199.0
Day 7: 199.0
Day 8: 198.0
or
Day 1: 200.0
Day 8: 198.0
Same result without all the grief.