The most extreme, suboptimal type of diet/ exercise program would ‘work’ up to a point.
Decided to lose weight and eat 800 calories a day? You'd lose weight.
Decided to start running every day to trim down? You'd trim down.
Decided to start strength-training with a really inefficient, injury-promoting exercise technique and programming? You'd gain muscle and get stronger.
Decided to eliminate one specific food or a food group because some writer in a fitness magazine said eating it 'is the...