I’m curious if somebody is overweight need more fuel and water? because they need to push harder ?
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There are two parts to this. If you are heavier, your base metabolic rate will burn more calories per hour - at least this is how myfitnesspal and other apps map it.
When riding your bike it is a simple calculation if you are using a power meter. The number of kilojoules of work done for a ride is approximately the same as the calories of energy your body has burned. Efficiency of the human body is only about 25% so the joules map to calories although there are approximately 4 joules / calorie.
So, either way, there are simple tools to check how much you need to eat and drink.
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As @Kicikacsa Julian says calorie expenditure is approximately relative to the power used. Or another way fuel in power out.
So in basic terms yes as it takes more power to move a given object the heavier it is or relative effort . However one could also agree that the level of effort doesn’t actually decrease as you get lighter. As the saying goes it doesn’t get easier you just go faster.
My other sayings are “don’t diet on the bike” and “fuel your workouts”
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Interesting topic. Good to know!
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Answered well here. Good work lads
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