According to Bodyidplan.com, people tend to be at their most productive on a Tuesday, and this is also the day when people devote the most time to themselves.
Meanwhile, May is the month when summer begins to take hold and dieters usually find it easier to lose weight in the summer months.
Nutritionist Sheila Boyde commented: "Animals react to the changing seasons with mood, metabolism and behaviour, and humans are the same.
"Evidence shows that our 'happy hormone', serotonin, increases during the longer and lighter days of summer. This is the time to capitalise on increased feelings of wellbeing and energy to begin your personalised diet plan."
Consumers are advised to focus on lighter foods accompanied by healthy salads and vegetables.
It is also a good time of year to take advantage of the improved weather and lighter nights and "venture forth out of the house" to exercise after work, Ms Boyde added.